Description of problem:
satellite-change-hostname fails to rename Red Hat Satellite Capsule server 6.7 


Version-Release number of selected component (if applicable):
Satellite Capsule 6.7


How reproducible:
Always


Steps to Reproduce:
1. Follow the steps mentioned in https://access.redhat.com/documentation/en-us/red_hat_satellite/6.6/html/administering_red_hat_satellite/sect-red_hat_satellite-administering_red_hat_satellite-renaming_a_server#sect-Red_Hat_Satellite-Administering_Red_Hat_Satellite-Renaming_a_Capsule_Server 



Actual results:


[root@scapsule ~]#  satellite-change-hostname newcapsule.example.com --username admin --password Redhat1! --certs-tar /root/newcapsule.example.com-certs.tar 
Checking for certs tarball

Checking hostname validity

***WARNING*** This script will modify your system.
You will need to re-register any foreman clients registered to this system after script completion.
 Have you taken the necessary precautions (backups, snapshots, etc...)?
Proceed with changing your hostname? [y/n]
y
Precheck passed
updating hostname in /etc/hostname
setting hostname
checking if hostname was changed
stopping services
removing old cert rpms
No Match for argument: capsule.example.com-foreman-client*
No Match for argument: capsule.example.com-tomcat*
deleting old certs
backed up /var/www/html/pub to /var/www/html/pub/capsule.example.com-20200428143308.backup
updating hostname in /etc/hosts
updating hostname in foreman installer scenarios
updating hostname in hammer configuration
sed: can't read /root/.hammer/cli.modules.d/*.yml: No such file or directory

Failed 'sed -i.bak -e 's/capsule.example.com/newcapsule.example.com/g' /root/.hammer/cli.modules.d/*.yml' with exit code 2



Expected results:

It should be getting completed without any errors.


Additional info:

It's happening because of the new changes introduced in "/usr/share/katello/hostname-change.rb" to update hammer configuration on Satellite but that breaks the process on capsule.
~~~
STDOUT.puts "updating hostname in hammer configuration"
self.run_cmd("sed -i.bak -e 's/#{@old_hostname}/#{@new_hostname}/g' #{hammer_root_config_path}/*.yml")
self.run_cmd("sed -i.bak -e 's/#{@old_hostname}/#{@new_hostname}/g' #{hammer_config_path}/*.yml")
~~~

If I comment on them at the beginning only, the satellite-change-hostname will be successful for capsule in one shot.

This piece of code is not present on earlier versions of Red Hat Satellite\Capsule.