LVM-activate: add OCF_CHECK_LEVEL to control monitor action

previous a299281a8ce34a226d380208c6fbc5f845778ad4 is not perfect
solution.
e.g. iscsi SAN IO timeout will return EIO, and it makes monitor failed.
So add OCF_CHECK_LEVEL option which allow user to chose if enable it.

Signed-off-by: Zhao Heming <heming.zhao@suse.com>