Remove peer address cache in ShardInformation

Remove peer address cache in ShardInformation

The ShardManager caches the peer addresses in the ShardInformation and
uses it mainly to suppress PeerUp, PeerDown and PeerAddressResolved
messages to the shard for peers that don't have replicas for the shard.

This is fine with static config but With the upcoming work to dynamically
add replicas, the shard will take ownership of persisting its peers so
the ShardManager will not know about dynamic peers.

I changed the semantics of the peer addresses to initial peer addresses.
They are now only used to pass to the Shard on creation. As a result,
PeerUp, PeerDown and PeerAddressResolved messages are now always sent to
the Shard for all peers. The Shard/RaftActor decide ll whether or not to
process the peer message. I changed RaftActorContextImpl#setPeerAddress
to ignore a peerId it doesn't know about instead of throwing an ex.

The other usages of the peerAddresses were to lookup the leader address.
This is now done dynamically via the ShardPeerAddressResolver.

Change-Id: Ida9738916a4a85d23198e7c095d5c73f17e2aa6c
Signed-off-by: Tom Pantelis <tpanteli@brocade.com>