LU-8551 test: Use mds1 rather than mds to operate on MDT0000

LU-8551 test: Use mds1 rather than mds to operate on MDT0000

Use mds1 rather than mds to operate on MDT0000, fixed following cases:
conf-sanity.sh: test_43, test_58, test_62
sanityn.sh:	test_54, test_55.

Test-Parameters: testlist=conf-sanity
Test-Parameters: testlist=sanityn

Change-Id: Ibe0b419f837e4478610d61b8efb54af93662a45e
Signed-off-by: Gu Zheng <gzheng@ddn.com>
Reviewed-on: http://review.whamcloud.com/22147
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Wang Shilong <wshilong@ddn.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>