Description of problem:

If virt-who hypervisor is part of more than one host collection, if we try to remove it from one host collection, it will be removed from all host collections.

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

Satellite 6.x

Steps to Reproduce:

1. Go to Satellite WebUI --> Hosts --> Content Hosts --> Select any hypervisor --> Host Collections --> Add --> select more than one host collection from list --> Add Selected

2.  Go to Satellite WebUI --> Hosts --> Content Hosts --> Select any hypervisor --> Host Collections --> List/Remove --> Select any one repository to remove --> Remove Selected

Actual results: 
It will remove the virt-who hypervisor from all host collections.

Expected results:
It should remove virt-who hypervisor from host collection which is selected only.

Additional info:

This scenario will work fine when we will remove virt-who hypervisor from host collection as below:

Go to Satellite WebUI --> Host Collections --> Click on host collection from which you want to remove hypervisor --> Hosts --> Select hypervisor --> Remove Selected

This will remove virt-who hypervisor from one selected host collection only.

And it will work fine for content-hosts in both ways.