LU-9980 tests: save specific facet in save_lustre_params()

LU-9980 tests: save specific facet in save_lustre_params()

In save_lustre_params(), while there are multiple server facets
having the same host, and the parameter has wildcard, duplicate
parameters with wrong facets will be saved.

This patch fixes the above issue by greping service name to save
the parameter with specific facet.

Test-Parameters: clientcount=4 osscount=2 mdscount=2 mdtcount=1 \
austeroptions=-R failover=true iscsi=1 testlist=replay-vbr

Change-Id: Icba3fc532f4c67f02272c39e8e64d49325dad0e7
Signed-off-by: Elena Gryaznova <elena.gryaznova@seagate.com>
Signed-off-by: Jian Yu <jian.yu@intel.com>
Reviewed-on: https://review.whamcloud.com/28963
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: James Nunez <james.a.nunez@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>