Description of problem:
System Snapshots are not created when Entitlements are added to a system via API call system.upgradeEntitlement.

Version-Release number of selected component (if applicable):
Satellite 5.4.1
Spacewalk 1.7

How reproducible:
100%

Steps to Reproduce:
1.Register System to Spacewalk 1.7. 
2.Add Provisioning entitlement to the System.
   Systems -> the System profile -> System Properties (Edit These Properties) -> check Provisioning 
3.Add Monitoring entitlement to the System.
  Systems -> the System profile -> System Properties (Edit These Properties) -> check  Monitoring

4.Systems -> the System profile -> Provisioning -> Snapshots
    There is a new Snapshot due to the changes made in  [2][3]

5. Remove the Monitoring Entitlemnt for the system
    Systems -> the System profile -> System Properties (Edit These Properties) -> uncheck  Monitoring

6. Try to add Monitoring entitlement to the system via API system.upgradeEntitlement.
 
  
Actual results:
When the entitlement is added via API new snapshot is not created under
Systems -> the System profile -> Provisioning -> Snapshots

Expected results:
When the system entitlements are altered via API new snapshot is created.

Additional info:
See: manage-system.py admin admin https://`hostname`/rpc/api UPGRADE_ENTITLEMENT 1000010000 [monitoring_entitled|provisioning_entitled|virtualization_host|virtualization_host_platform]