CBLT-254:  supply credentials to curl to upload artifacts to maven repo!

Change-Id: Idaa742775d17974ba605dac897208774d7d50acd
Reviewed-on: http://review.couchbase.org/35558
Reviewed-by: Philip Labee <philip@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>