CBLT-42:  remove trailing space in set command.

Other OSes do this for you, that is, you need to
take steps to have a variable have trailing whitespace.

Change-Id: I02d1f0d3d13d836244cd6c598b42816926d5d27e
Reviewed-on: http://review.couchbase.org/37385
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>