SPY-145: Make MemcachedConnection inline properly.

Change-Id: I1be0a3ea410e9bed0a155ac821d41bf64125beac
Reviewed-on: http://review.couchbase.org/30417
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>
Reviewed-by: Matt Ingenthron <matt@couchbase.com>