Introduce qemu-img check subcommand (Kevin Wolf)

From: Kevin Wolf <kwolf@redhat.com>

Now that block drivers can provide check functions, expose them through
qemu-img.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>


git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@7215 c046a42c-6fe2-441c-8c8c-71466251a162
