Add some very basic quota sanity tests for generic filesystems.

Add some very basic quota sanity tests for generic filesystems.

This is based on test 108, but uses the generic quota tools,
not xfs_quota, and therefore cannot test project quota.

Also, the IOs are much smaller (48k) so that ext3 won't get into
indirect blocks and throw off the accounting.  This does
assume 4k blocks though.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Lachlan McIlroy <lmcilroy@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>