iotests: Remove 130 from the "auto" group

Peter hit a "Could not open 'TEST_DIR/t.IMGFMT': Failed to get shared
'write' lock - Is another process using the image [TEST_DIR/t.IMGFMT]?"
error with 130 already twice. Looks like this test is a little bit
shaky, and currently nobody has a real clue what could be causing this
issue, so for the time being, let's disable it from the "auto" group so
that it does not gate the pull requests.

Signed-off-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

tests/qemu-iotests/group

@@ -151,7 +151,7 @@
 127 rw backing quick
 128 rw quick
 129 rw quick
-130 rw auto quick
+130 rw quick
 131 rw quick
 132 rw quick
 133 auto quick