In case of IP reuse locally there was a race condition
that was leaving the overlay namespace with wrong configuration
causing connectivity issues.
This commit introduces the use of setMatrix to handle the transient
state and make sure that the proper configuration is maintained

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>

peerDB was never being flushed on network delete
leaveing behind stale entries

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>

Avoid error logs in case of local peer case, there is no need for deleteNeighbor
Avoid the network leave to readvertise already deleted entries to upper layer

Signed-off-by: Flavio Crisciani <flavio.crisciani@docker.com>