LU-6030 osd-ldiskfs: improve mount option handling

LU-6030 osd-ldiskfs: improve mount option handling

--handle force-over-128tb option to osd layer
--handle bigendian-check option to osd layer
--strip out extents option & remove extents-mount-options patch
--strip out iopen & mballoc mount options
--back LDISKFS_SUPER_MAGIC to EXT4_SUPER_MAGIC

Signed-off-by: Yang Sheng <yang.sheng@intel.com>
Change-Id: Ic9bf431d0826d6279fc76f7fd1d7e356e421f292
Reviewed-on: http://review.whamcloud.com/13572
Reviewed-by: Bob Glossman <bob.glossman@intel.com>
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Tested-by: Jenkins
Reviewed-by: Alex Zhuravlev <alexey.zhuravlev@intel.com>
Tested-by: Maloo <hpdd-maloo@intel.com>