Add UTs for MasqueradeManager.
Add UTs for MasqueradeManager.

ocadotechnology/calico,alexhersh/calico,anortef/calico,kasisnu/calico,matthewdupre/felix,alexhersh/calico,Metaswitch/calico,neiljerram/felix,TrimBiggs/calico,anortef/calico,neiljerram/felix,neiljerram/felix,beddari/calico,beddari/calico,Metaswitch/calico,TrimBiggs/calico,kasisnu/calico,neiljerram/felix,ocadotechnology/calico,matthewdupre/felix