LU-3003 tests: Do "lctl conf_param" on mds1 in t32_test()

LU-3003 tests: Do "lctl conf_param" on mds1 in t32_test()

With DNE, conf-sanity 32c inovkes "lctl conf_param" on mds2's host,
which may not be where the MGS is running, causing errors like:

  CMD: c05 /usr/sbin/lctl conf_param
  t32fs-MDT0001.mdc.max_rpcs_in_flight=9
  c05: No device found for name MGS: Invalid argument
  c05: This command must be run on the MGS.
  c05: error: conf_param: No such device
   conf-sanity test_32c: @@@@@@ FAIL: Setting MDT1
  "max_rpcs_in_flight"

This patch changes these "lctl conf_param" commands to set the same
parameters but on mds1's host, which always hosts the MGS.

Change-Id: Ibdca2802eaf33db504ed2b41a356d7a18be33f10
Signed-off-by: Li Wei <wei.g.li@intel.com>
Reviewed-on: http://review.whamcloud.com/5829
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Niu Yawei <yawei.niu@intel.com>
Reviewed-by: wangdi <di.wang@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>