[PATCH] xfstests: introduce xfs 323/324 tests to verify turn group/project quota off

[Jeff Liu]

Hi folks,

This series is trying to introduce two XFS test cases to verify that we can
turn group/project quota off while user quota is on.  Both tests are isolated
to run against CRC enabled super block to enlarge the test coverage with
both group and project quota can be mounted.

This first patch introduce a new pre-checkup routine to check if the test
storage is CRC enabled or not, as well as refactoring of xfs/299 to make
use of it.

Thanks,
-Jeff