Description of problem:
The host is not getting registered using global registration method but it's getting registered using subscription-manager

Version-Release number of selected component (if applicable):


How reproducible:
100%

Steps to Reproduce:
1.Generate curl command using Global registration and execute it on the client system to register it. It fails with error 

ERROR: Validation failed: Name can't be blank, Name hostname can contain only lowercase letters, numbers, dashes and dots according to RFC921, RFC952 and RFC1123


2. Use subscription-manager to register the host. Its successful.


Actual results:
# curl -X GET "https://dhjoshi-rhsat.syslab.pnq2.redhat.com:9090/register?activation_key=test_ak_7&location_id=2&organization_id=1&setup_insights=false" -H 'Authorization: Bearer eyJhbGciOiJIUzI1NiJ9.eyJ1c2VyX2lkIjo0LCJpYXQiOjE2MTIyOTYzODUsImp0aSI6IjNmZWExYmQ2YWMyZjYwNGMyNTUzNzE1OWQxNzBlM2E2ZDcxZDU0NzdhYTNiZWU4OTBlZTg1ODQ4NTIwN2JhZjAiLCJleHAiOjE2MTIzMTA3ODV9.wHc37GgmUDu75msyhkzNq75VAZlzJi2iS9MVG0eu_ms' | bash
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100 10361  100 10361    0     0  25599      0 --:--:-- --:--:-- --:--:-- 25582
#
# Running registration
#
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  8616  100  8616    0     0  1231k      0 --:--:-- --:--:-- --:--:-- 1402k
Loaded plugins: product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

Examining /tmp/tmp.dGdCEUcNyB.rpm: katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com-1.0-1.noarch
Marking /tmp/tmp.dGdCEUcNyB.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com.noarch 0:1.0-1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===============================================================================================================================================
 Package                                                              Arch               Version             Repository                   Size
===============================================================================================================================================
Installing:
 katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com             noarch             1.0-1               /tmp.dGdCEUcNyB              20 k

Transaction Summary
===============================================================================================================================================
Install  1 Package

Total size: 20 k
Installed size: 20 k
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
  Installing : katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com-1.0-1.noarch                                                       1/1 
  Verifying  : katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com-1.0-1.noarch                                                       1/1 

Installed:
  katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com.noarch 0:1.0-1                                                                      

Complete!
The system has been registered with ID: db790995-59ef-4dc3-b1d7-bb5c58843f3b
The registered system name is: vm254-162.gsslab.pnq2.redhat.com
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100   241  100   177  100    64    470    169 --:--:-- --:--:-- --:--:--   470
ERROR: Validation failed: Name can't be blank, Name hostname can contain only lowercase letters, numbers, dashes and dots according to RFC921, RFC952 and RFC1123

# hostname
vm254-162.gsslab.pnq2.redhat.com


Expected results:
the host should be registered successfully.

Additional info:

# curl --insecure --output katello-ca-consumer-latest.noarch.rpm https://dhjoshi-rhsat.syslab.pnq2.redhat.com/pub/katello-ca-consumer-latest.noarch.rpm
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  8616  100  8616    0     0  46771      0 --:--:-- --:--:-- --:--:-- 47081
[root@vm254-162 ~]# yum localinstall katello-ca-consumer-latest.noarch.rpm -y
Loaded plugins: product-id, search-disabled-repos, subscription-manager

This system is not registered with an entitlement server. You can use subscription-manager to register.

Examining katello-ca-consumer-latest.noarch.rpm: katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com-1.0-1.noarch
Marking katello-ca-consumer-latest.noarch.rpm to be installed
Resolving Dependencies
--> Running transaction check
---> Package katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com.noarch 0:1.0-1 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

===============================================================================================================================================
 Package                                                         Arch          Version         Repository                                 Size
===============================================================================================================================================
Installing:
 katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com        noarch        1.0-1           /katello-ca-consumer-latest.noarch         20 k

Transaction Summary
===============================================================================================================================================
Install  1 Package

Total size: 20 k
Installed size: 20 k
Downloading packages:
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
Warning: RPMDB altered outside of yum.
  Installing : katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com-1.0-1.noarch                                                       1/1 
  Verifying  : katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com-1.0-1.noarch                                                       1/1 

Installed:
  katello-ca-consumer-dhjoshi-rhsat.syslab.pnq2.redhat.com.noarch 0:1.0-1                                                                      

Complete!

# subscription-manager register --org="RedHat" --activationkey="test_ak_7"
The system has been registered with ID: 66c6c393-c4e6-481d-acad-30cd40c67da0
The registered system name is: vm254-162.gsslab.pnq2.redhat.com

# subscription-manager status
+-------------------------------------------+
   System Status Details
+-------------------------------------------+
Overall Status: Disabled
Content Access Mode is set to Simple Content Access. This host has access to content, regardless of subscription status.

System Purpose Status: Disabled