MAP Client Only connect MNS in connected state

Only allow the MNS to connect when the MAS client is in the connected
state, this prevents the possibility of the MNS client from connecting
if the MAS fails to connect.

Bug: 135088863
Test: disallow MAS connection and verify MNS notifications don't arrive.
Change-Id: I75de88e74708283ebbaef70251f7575c0da0c4d4