This CR Allows Type A config updates while rejecting the type B ones for
the etcd/raft consenter.

For definition of Type A and Type B config updates please refer to the
JIRA.

Change-Id: If7351eb28fe66ff7ca31e45206ed044ee2937051
Signed-off-by: Adarsh Saraf <adarshsaraf123@gmail.com>