Fix lost anti_affinity field from Cluster Template

Refactored methods for creating Clusers, so that
default values are applied correctly and parameters
pased to this method are not modified.

Fixes: bug #1232065

Change-Id: I3c3db41a47042e76ad42b01a94d7e3f17a093e81
Merge "Fix lost anti_affinity field from Cluster Template"