Provide a way to trigger Drools rules when an update occurs

Provide a way to trigger Drools rules when an update occurs

An instance of 'DroolsInitFeature.Init' is inserted into a Drools
session when it is initialized, updated, or restored from
persistent data. This provides an opportunity to catch more
initialization scenarios than you can with an empty 'when' clause.

Updates:

1) Change 'DroolsInitFeature' to use Policy Engine scheduled executor

2) Add new test to 'DroolsInitFeatureTest' to verify that the 'Init'
   object is inserted into and deleted from Drools memory

3) Remove trailing spaces

Issue-ID: POLICY-1948
Change-Id: I4748c2415c4563e98b4a53d573c9ebe1e96e8e34
Signed-off-by: Straubs, Ralph (rs8887) <rs8887@att.com>