Fix incorrect connection ID for remote connection service

Also cleans up incidental issues including:
* Remote connection service disconnects from the service it
  represents if it is not currently handling any connections;
  hope to avert excessive service pinning in the future.
* Fix destroyed connection handling.

Bug: 16828152
Change-Id: Id4555f91ddac5e9c1a12ce00bfd1ee0d6d2cb1d9