LU-4515 tests: disable sanity-quota test_34 temporary

To avoid other patches to be failed for LU-4515.

Signed-off-by: Fan Yong <fan.yong@intel.com>
Change-Id: I8a6949d18a1ff4f5d229ed083f4f12a667eb3329
Reviewed-on: http://review.whamcloud.com/8981
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins