qemu-iotests: Introduce _unsupported_imgopts

Introduce _unsupported_imgopts that causes _notrun for specific image
options.

Signed-off-by: Fam Zheng <famz@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>

tests/qemu-iotests/common.rc

diff --git a/tests/qemu-iotests/common.rc b/tests/qemu-iotests/common.rc
index 28ba0d9..2489c43 100644
--- a/tests/qemu-iotests/common.rc
+++ b/tests/qemu-iotests/common.rc
@@ -406,6 +406,17 @@
     fi
 }
 
+_unsupported_imgopts()
+{
+    for bad_opt
+    do
+        if echo "$IMGOPTS" | grep -q 2>/dev/null "$bad_opt"
+        then
+            _notrun "not suitable for image option: $bad_opt"
+        fi
+    done
+}
+
 # this test requires that a specified command (executable) exists
 #
 _require_command()