LU-2469 tests: use MDS/OSTDEV and MDS/OSTDEVBASE with zfs

Add support for using MDSDEVn, OSTDEVn, MDSDEVBASE and OSTDEVBASE
variables when testing with zfs.
Add *ZFSDEVn variable for specifying ZFS format devices.
Remove use of *DEVn use outside of test-framework.sh

MDSDEV et al. specify physical device formatted.

Formerly Change-Id I89115ce935294cdbbd6620fec3f9dc3eb76f8960

Test-Parameters: mdsfilesystemtype=zfs ostfilesystemtype=zfs  mdtfilesystemtype=zfs testlist=sanity
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Change-Id: If6506995d9d61f9c97827f45071f0d317c7a09f9
Reviewed-on: http://review.whamcloud.com/5016
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Jian Yu <jian.yu@intel.com>
Reviewed-by: Li Wei <wei.g.li@intel.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
LU-3321 obdclass: Add a preallocated percpu cl_env

This change adds support for a single preallocated cl_env per CPU
which can be used in circumstances where reschedule is not possible.
Currently this interface is only used by the ll_releasepage function.

Signed-off-by: Jinshan Xiong <jinshan.xiong@intel.com>
Signed-off-by: Prakash Surya <surya1@llnl.gov>
Change-Id: I14a06294f0c2caae8806d7da134a8076f75ddc81
Reviewed-on: http://review.whamcloud.com/8174
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>