SPY-166: Only readd a WRITE_QUEUED operation, not clone it in addition.

Motivation
----------
When a WRITE_QUEUED operation is redistributed, it needs to be readded
but not cloned (since its still in a sendable state).

Modification
------------
Return after adding the operation again.

Result
------
The operation is readded and not cloned afterwards too.

Change-Id: I79fec436aa538a8a4074e82f69b3ed186c5126b7
Reviewed-on: http://review.couchbase.org/36258
Reviewed-by: Matt Ingenthron <matt@couchbase.com>
Tested-by: Michael Nitschinger <michael.nitschinger@couchbase.com>