LU-8340 tests: in sanity-sec 25 client nodemap must be admin

LU-8340 tests: in sanity-sec 25 client nodemap must be admin

If the ENABLE_QUOTA is set, then cleanup_and_setup_lustre will use
the client node to setup quota, which requires admin privileges on
the nodemap. This patch enables admin privileges on all clients
before calling cleanup_and_setup_lustre.

Test-Parameters: envdefinitions=ENABLE_QUOTA=yes
Signed-off-by: Kit Westneat <kit.westneat@gmail.com>
Change-Id: If8d92d20aaa8cf75e3d443d1a81ff2f201d118cc
Reviewed-on: http://review.whamcloud.com/22750
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>