LU-7111 revert: b=22386 disallow wrong conf_param options

LU-7111 revert: b=22386 disallow wrong conf_param options

Don't fail mount if there are unrecognized parameters.  They may
change or be retired over time.

This reverts commit 12b6a5593a1d876ca1be91303da85a93ef6a92ca.

Change-Id: I806fd2345b854c8464632125210f84c7a029b78d
Signed-off-by: Nathaniel Clark <nathaniel.l.clark@intel.com>
Reviewed-on: http://review.whamcloud.com/21112
Tested-by: Jenkins
Tested-by: Maloo <hpdd-maloo@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Parinay Kondekar <parinay.kondekar@seagate.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>