xfstests: move xfs specific tests out of top directory

And into tests/xfs. Tests found and moved via:

$ grep "supported_fs xfs$" [0-2]* | cut -d : -f 1 > xfs.tests
$ for i in `cat xfs.tests`; do
> git mv $i* tests/xfs/
> grep ^$i group >> tests/xfs/group
> sed -i -e "/^$i/d" group
> done

Output now looks like:

 sudo ./check -g quick -r
FSTYP         -- xfs (debug)
PLATFORM      -- Linux/x86_64 test-1 3.5.0-rc5-dgc+
MKFS_OPTIONS  -- -f -bsize=4096 /dev/vdb
MOUNT_OPTIONS -- /dev/vdb /mnt/scratch

xfs/170  4s
generic/120      16s
generic/248      0s
generic/213      0s
generic/256      39s
xfs/121  6s
xfs/026  11s
generic/131      1s
xfs/187  1s
generic/135      0s
....

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Phil White <pwhite@sgi.com>
[rjohnston@sgi.com did not move test 032, belongs in shared]
Signed-off-by: Rich Johnston <rjohnston@sgi.com>

tests/xfs/292.out

@@ -0,0 +1,5 @@
+QA output created by 292
+mkfs.xfs without geometry
+meta-data=FILENAME   isize=256    agcount=4, agsize=16777216 blks
+mkfs.xfs with cmdline geometry
+meta-data=FILENAME   isize=256    agcount=16, agsize=4194304 blks