btrfs: reorder arguments so that options come first

btrfs: reorder arguments so that options come first

The option parser in the btrfs utility is going to be updated and
will accept arguments in a stricter form, namely that options must
come before their non-option argument. Otherwise eg. the -f option
in send would be understood as another path and not an option
leading to many test failures.

The canonical form should be:

  btrfs command subcommand [-options] [arguments]

Signed-off-by: David Sterba <dsterba@suse.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>