LU-4206 tests: cancel data lock before ELC test

Since 2,4, MDT will send unlink request to the OST, and OST
will destroy the object and revoke the data lock in the client
cache, i.e. client will not do ELC for data lock during the
rename and unlink. So cancel the data lock before couting
lock block callback counting.

Signed-off-by: wang di <di.wang@intel.com>
Change-Id: Ib216d068e71dce8236f26cb62188fff6d090042a
Reviewed-on: http://review.whamcloud.com/10250
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
LU-5010 llite: disable readahead optimization

There exists a race between readahead lock matching and lock
cancellation, where it's difficult to discard pages from radix
tree if readahead process keeps adding pages.

This issue is introduced in patch http://review.whamcloud.com/8523
here I'm going to disable it. The optimization will be added
back in later patch.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Change-Id: Ifa729bfc4404ac287d4af3a88ead4790218817f8
Reviewed-on: http://review.whamcloud.com/10220
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Lai Siyao <lai.siyao@intel.com>
Reviewed-by: Bobi Jam <bobijam@gmail.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>