LU-2211 quota: cache return code of acq for 1s

LU-2211 quota: cache return code of acq for 1s

Cache failed return code of acquire request for 1s to avoid
request flooding with EINPROGRESS and cumulative timeout on
ETIMEOUT when the master isn't responsive.

Signed-off-by: Johann Lombard <johann.lombardi@intel.com>
Change-Id: I3c212055b1ed6cd3671e69a0cff079dae831af61
Reviewed-on: http://review.whamcloud.com/4380
Tested-by: Hudson
Reviewed-by: Fan Yong <yong.fan@whamcloud.com>
Tested-by: Maloo <whamcloud.maloo@gmail.com>
Reviewed-by: Niu Yawei <niu@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>