Cherry picking change merged in master

Describe process for configuring
and reconfiguring Raft nodes and
a Raft ordering service.

Change-Id: I811f0f55abcc344ba6d9fee83b2c9c6697fed653
Signed-off-by: joe-alewine <Joe.Alewine@ibm.com>
(cherry picked from commit d05417e21b22cbdb3ec2132ae73533e71c629df7)