Description of problem:
 New snapshot is not created when child channel is added/removed via API. 

Version-Release number of selected component (if applicable):
Satellite [541|550]

How reproducible:
100%

Steps to Reproduce:
1. Create Custom Base Channel and Custom Child Channel.
2. Register a System.
3. Set the "Custom Base Channel" as a Base channel for the system.
4. Add "Custom Child Channel" to  the system using API call 

 system.setChildChannels(string sessionKey, int serverId, array[string channelLabel])

The same thing Base Channel.
 system.setBaseChannel(string sessionKey, int serverId, string channelLabel)


Actual results:
When the child channel is added  new snapshot is not created in
Systems -> the System profile -> Provisioning -> Snapshots

Expected results:
New snapshot is  created.

Additional info:
The same issue is reported for spacewalk-channel (backend).
Bug 854571 - New snapshot is not created when child channel is added/removed via spacewalk-channel.