core: Change duplicate action type values to unique ones

Since the action type value is supposed to be unique, a test
will be added to enforce uniqueness of the action type values
prior to that, since we have duplicate values in the VdcActionType
class we have to change first the duplicate values to different values
to ensure uniqueness

Change-Id: I6de787be50f8ef0149805bd0292ece2ab81aa465
Signed-off-by: Tal Nisan <tnisan@redhat.com>