shared: test mount needs_recovery extN partition with noload option

shared: test mount needs_recovery extN partition with noload option

Once upon a time, ext4 encounter NULL pointer dereference under this
situaiton due to jump to a wrong label. Part of this commit fixed
this Oops:

744692d ext4: use ext4_get_block_write in buffer write

We can also run this test on ext2/3.

This case is based on a script from Monakhov Dmitriy @ openvz.

Cc: Monakhov Dmitriy <dmonakhov@openvz.org>
Signed-off-by: Xiong Zhou <xzhou@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>