xfs: modify quota tests to work on generic filesystems

Fix several xfs quota tests to work on non-xfs filesystems.

New _require function to be sure that the xfs_quota tool can operate
on foreign filesystems; if it can, and if it needs to, it adds "-f"
to the XFS_QUOTA_PROG variable.

Modify _qmount to do quotacheck/quotaon to mount and /enable/
quota.  On xfs this isn't needed and/or fails; it's ignored.

All quota-related options used as arguments to _qmount are changed
from i.e. uquota to i.e. usrquota; the latter is standard across
almost all linux filesytems, including xfs.

xfs/260 filters out the root/default quota line, because ext4
consumes a different amount of space than xfs, and it's not what
we're testing for, so just ignore it.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Reviewed-by: Bill O'Donnell <billodo@redhat.com>
Signed-off-by: Eryu Guan <eguan@redhat.com>

tests/xfs/118

@@ -47,11 +47,12 @@ _cleanup()
 # real QA test starts here
 
 # Modify as appropriate.
-_supported_fs xfs
+_supported_fs generic
 _supported_os IRIX Linux
 
 _require_scratch
-_require_xfs_quota
+_require_quota
+_require_xfs_quota_foreign
 
 _chowning_file()
 {
@@ -72,10 +73,10 @@ _chowning_file()
 }
 
 echo "mkfs on scratch"
-_scratch_mkfs_xfs >$seqres.full
+_scratch_mkfs >$seqres.full 2>&1
 
 echo "mount with quotas"
-export MOUNT_OPTIONS="-o uquota"
+export MOUNT_OPTIONS="-o usrquota"
 _scratch_mount
 
 echo "creating quota file with holes"