in-band: Better adapt to new rconn usage pattern.

in-band: Better adapt to new rconn usage pattern.

Previously, in-band control was always handed a single rconn whose remote
target changed as the selected controller was changed or added or removed.
Now, however, the rconns handed to in-band control never change their
remote IP targets (instead, new rconns are added and old ones are removed),
so there is no point in looking for changes in remote IP address.

Suggested-by: Justin Pettit <jpettit@nicira.com>