LU-5030 tests: delete old quota test script

LU-5030 tests: delete old quota test script

The sanity-quota-old.sh test script was for testing new clients
against pre-2.4 servers.  However, testing those old servers is
no longer needed and we can delete this script entirely.

Signed-off-by: Andreas Dilger <andreas.dilger@intel.com>
Change-Id: I383949f36dbcfcfab34ec17c687aec0071ea6073
Reviewed-on: http://review.whamcloud.com/17700
Tested-by: Jenkins
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: James Simmons <uja.ornl@yahoo.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wei Liu <wei3.liu@intel.com>
Reviewed-by: Ryan Haasken <haasken@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>