Set to non-voting if not in server confguration

On recovery, if a RaftActor is not in its own recovered
ServerConfigurationPayload list, then set itself to a non-voting member
so it stays at Follower and doesn't try to start an election.

This scenario is an edge case for Shards as, normally, when a server is
removed, it self-destructs and is removed from the ShardManager. However
there is a small window where disconnect or shutdown could prevent
ShardManager removal from occurring. This patch protects against a server
restart causing disruption after removal.

Change-Id: I64ecd89cddec7a4e1711e0d8d17c7ea6b36e29a0
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>