Update cluster op-version on moving out of befriended state

Change-Id: Ie2c92e3c6158d47ea593808058b8e874eae88729
Consider only peers in befriended state

Change-Id: If3b04db790ba617663d8a545196904455f2b75d8
Update op-version whenever a peer is removed.

Change-Id: I5403cc8c48269f3cbe8859e1905c958ba0dbe4c6