LU-2877 Add a roundtrip delay in sanity test 34h

LU-2877 Add a roundtrip delay in sanity test 34h

It seems we are still getting false failures in test 34h due to
overloaded server that takes longer than 2 seconds to process
a request.
To even things out - do another sync RPC to OST first before
starting the timeout.

Change-Id: I070345233398d7a15a105162523ef6dc81c1a929
Signed-off-by: Oleg Drokin <oleg.drokin@intel.com>
Reviewed-on: http://review.whamcloud.com/5882
Tested-by: Hudson
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>