CBD-1346: clean up .repo directory at post operation

Change-Id: Idc28462f83bc0e5a64b873549104abeb76576233
Reviewed-on: http://review.couchbase.org/35750
Reviewed-by: Philip Labee <philip@couchbase.com>
Reviewed-by: Eric Limare <eric.limare@couchbase.com>
Tested-by: Eric Limare <eric.limare@couchbase.com>