Revert "LU-2675 obd: decruft md_enqueue() and md_intent_lock()"

This reintroduced back LU-4805, so reverting.

This reverts commit a2877f1f6c0fd0ec5ece836a216f42af3ef913da.

Change-Id: Id6728d4fa6a322a45579f0ce744d4c7161ac9d69
Reviewed-on: http://review.whamcloud.com/10203
Tested-by: Jenkins
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Tested-by: Oleg Drokin <oleg.drokin@intel.com>
LU-4981 tests: remount FS after writes to /proc

We should remount FS after writes all proc entry in 133g,
because some upcall value under /proc will be assigned to
some gabarge value, which will cause failures in the
following test.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: Ic120e19651a4a7897a6329a93feff1644c778286
Reviewed-on: http://review.whamcloud.com/10174
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>