ALLJOYN-1911: LocalEndpoint::Stop() is not allowed to block, yet it was blocking

Change-Id: Id01c9569a753e56c74797a0869a26936d03162e5
ALLJOYN-1921 Fix off-by-one error due to post-increment operator.

Change-Id: I52d8c679cbffd24ca643dfd14700da10e438a52c
Correct the remaining router_advertisement_prefix

The older router_advertisement_prefix is still around (commented out)
in a few other conf files. Replaced them with the updated prefix
to avoid unnecessary confusion.

Change-Id: I7db8fec3ca5007d4242b47fc797e62407fc1afa3