fstests: test for CONFIG_QFMT_V2 in _require_quota

fstests: test for CONFIG_QFMT_V2 in _require_quota

When CONFIG_QUOTA is enabled but CONFIG_QFMT_V2 is disabled in the
kernel config, many quota tests on ext4 will fail in odd ways,
when in fact they should be _notrun. Add a CONFIG_QFMT_V2 test to
_require_quota() to catch this for filesystems that require it.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Bill O'Donnell <bodonnel@redhat.com>
Signed-off-by: Zorro Lang <zlang@kernel.org>