the inservice field on the Cluster object isn't updated when connection to a Cluster is restored

[parhamdoustdar]

Steps to reproduce:

1. Modify the apiMaster field of a Cluster object so that Shipper will lose connection
2. Observe that the Cluster now has a field called inservice set to false
3. Return the apiMaster to the correct value
4. Observe that the inservice field is still false