check-all: don't ignore -j option

This option controls paralelism in tests. It was there with the 2.3
version of lcb, but accidentally got removed/clobbered while migrating
to cliopts

Change-Id: I669213ae20862f9e5d7798386339c9530872ad6a
Reviewed-on: http://review.couchbase.org/39459
Reviewed-by: Brett Lawson <brett19@gmail.com>
Tested-by: Mark Nunberg <mnunberg@haskalah.org>