Adding augeas insertion check.
Augeas change call will fail if key does not exists in policy.json.
This fix will add the key/value if it doesn't exists or will change the
value to match.
Added unit test.
Change-Id: Ibd97228c431fa6b23e8a15ce548f82f649131cc2
Merge "Adding augeas insertion check. Augeas change call will fail if key does not exists in policy.json. This fix will add the key/value if it doesn't exists or will change the value to match. Added unit test. Change-Id: Ibd97228c431fa6b23e8a15ce548f82f649131cc2"