Separate out the kubewatcher service from fission

[soamvasani]

The kubewatcher service is pretty much independent of Fission. Only the API is dependent on the fission.Watch type, which may as well be a K8s resource; then watchSync.go can be changed to a the usual K8s controller loop instead of watching the Fission API.

This issue will track the work of removing the fission-specific bits and moving to a K8s resource and controller.