LU-1634 test: Check client only for version matching

LU-1634 test: Check client only for version matching

For reliability, we should check nidtbl versions on the client only
to make sure the client is not notified if IR on the MGS is disabled.
Otherwise, if the MGS can't respond while OST is restarting, the
nidtbl version won't be updated and this will fail the test.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: I903add4261f5fb133ae4ac170b10c0783c226e29
Reviewed-on: http://review.whamcloud.com/3511
Tested-by: Hudson
Reviewed-by: Yu Jian <yujian@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>