qemu-img: show help for invalid global options

qemu-img: show help for invalid global options

The qemu-img sub-command executes regardless of invalid global options:

  $ qemu-img --foo info test.img
  qemu-img: unrecognized option '--foo'
  image: test.img
  ...

The unrecognized option warning may be missed by the user.  This can
hide incorrect command-lines in scripts and confuse users.

This patch prints the help information and terminates instead of
executing the sub-command.

Signed-off-by: Stefan Hajnoczi <[email protected]>
Message-id: 20170317104541[email protected]
Reviewed-by: Eric Blake <[email protected]>
Signed-off-by: Max Reitz <[email protected]>