LU-2712 tests: enable sanity/sanityn SLOW tests

LU-2712 tests: enable sanity/sanityn SLOW tests

Enable a number of subtests in sanity.sh and sanityn.sh that are
currently skipped for normal "review" builds because of "SLOW=no".
Checking the maloo test history for these tests, they are verified
as always passing for "full" builds in the SLOW=yes case.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I340ccdf1323d14a34dc87a5217b3256c8f62cab0
Reviewed-on: http://review.whamcloud.com/5218
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Keith Mannthey <keith.mannthey@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>