remove cbtop and priority15 from develop section

Change-Id: I7ca57a5a79dbea8e5f864e3ab2330d6b39d8ea1d
Reviewed-on: http://review.couchbase.org/24667
Tested-by: buildbot <build@couchbase.com>
Reviewed-by: Pavel Paulau <pavel.paulau@gmail.com>