Fix mke2fs -F for consistency with the man page

I try to fix mke2fs -F for consistency with the man page. The previous version of this patch series is as follows:

http://patchwork.ozlabs.org/patch/253634/
http://patchwork.ozlabs.org/patch/253633/

Change log:
- rephrase the patch description
- add reviewed-by to 1/2 patch

 configure.in           |    2 ++
 lib/ext2fs/ismounted.c |   38 ++++++++++++++++++++++++++++++++++++++
 misc/util.c            |    4 ++--
 3 files changed, 42 insertions(+), 2 deletions(-)

Ted, could you please merge this patchset if you don't have any comments.

http://patchwork.ozlabs.org/patch/256301/
http://patchwork.ozlabs.org/patch/256302/

Regards,
Kazuya Mio