Move tap only functions from ConnMap to TapConnMap

In order to make it easier to work with the ConnMap we should move
these functions to the TapConnMap.

Change-Id: I0a04982c1dd608397adb219c954d1994b9b3592d
Reviewed-on: http://review.couchbase.org/34202
Reviewed-by: Michael Wiederhold <mike@couchbase.com>
Tested-by: Michael Wiederhold <mike@couchbase.com>