common/config: add acl and user_xattr support for TEST_DEV

common/config: add acl and user_xattr support for TEST_DEV

On RHEL6.9GA, generic/097 fails for ext4 because _test_cycle_mount()
remount ext4 without the user_xattr option, so extended attributes
are not supported by ext4.

On some old kernels, ext4 filesystem can not be mounted with acl and
user_xattr options by default.  The following patch has enabled
these options by default:
'ea6633369458("ext4: enable acls and user_xattr by default")'

We add acl and user_xattr support in _test_mount_opts(), and it
works normally on all kernels.

Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com>
Reviewed-by: Eryu Guan <eguan@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>