Description of problem:
subscription-manager register --name=SYSTEMNAME doesn't work in Red Hat Satellite server if the SYSTEMNAME and output of "hostname -f" is different.

---> "--name=SYSTEMNAME" is not taken into consideration and only "hostname -f" is considered in Red Hat Satellite server.

---> "--name=SYSTEMNAME" works well if host is registered with "subscription.rhsm.redhat.com"

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


How reproducible:
 very easily.

Steps to Reproduce:
1. Set the hostname to some random value like "test1.example.com"

# hostnamectl set-hostname test1.example.com

2. Let's have two scenarios
Scenario a: Host will be registered with Satellite server:

Execute command: # subscription-manager register --name=test2.example.com
Output: The registered system name is: test2.example.com
On Red Hat Satellite server: host will be listed with hostname "test1.example.com"

Scenario b: Host will be registered with cdn 9"subscription.rhsm.redhat.com"):

Execute command: # subscription-manager register --name=test2.example.com
Output: The registered system name is: test2.example.com
On customer portal: host will be listed with hostname "test2.example.com"


Actual results:
Output: The registered system name is: test2.example.com
On Red Hat Satellite server: host will be listed with hostname "test1.example.com"

Expected results:
Output: The registered system name is: test2.example.com
On customer portal: host will be listed with hostname "test2.example.com"