generic: assign a few tests to additional groups

generic: assign a few tests to additional groups

The rationale behind the proposed changes is to correct and improve
granularity of some generic tests, so it becomes possible to control
lists of run tests better, if there is given additional information
about a test environment and tested filesystems.

* generic/459 test is added to freeze group
* generic/482 test is added to thin group
* generic/529 test is added to acl group
* generic/530 test is added to shutdown group

Signed-off-by: Vladimir Zapolskiy <vladimir@tuxera.com>
Reviewed-by: Zorro Lang <zlang@redhat.com>
Signed-off-by: Eryu Guan <guaneryu@gmail.com>