GOCBC-402: Update ReplaceEx to use cmdReplace not cmdSet
GOCBC-402: Update ReplaceEx to use cmdReplace not cmdSet

Change-Id: I9f557553559a16bbd5befde2d383fdefec021c8b
Reviewed-on: http://review.couchbase.org/105909
Reviewed-by: Brett Lawson <c8c4369773d7d7226e031f0c4af62e3f38a08510@gmail.com>
Tested-by: Charles Dixon <e13bf4498b4994e133fd3586350658dc4a59329a@gmail.com>

brett19/gocbcore