CBLT-267:  move license files into build repo, under license/<product_name>

Change-Id: Iec94f29fa56d405edada2688bc35e8ef3be1397e
Reviewed-on: http://review.couchbase.org/36117
Reviewed-by: Jens Alfke <jens@couchbase.com>
Tested-by: Philip Labee <philip@couchbase.com>