Fix support_check log message and add UDF check

Also make the iso-with-qcow2 image not use UDF since centos/rocky
won't get that test coverage otherwise.

Change-Id: Ic7f0cb19ee767f51225539e8821fc89dd45190af

generate.py

@@ -102,7 +102,8 @@ def main():
         if args.only and args.only != image['name']:
             continue
         if 'support_check' in image and not is_supported(image):
-            LOG.warning('Unable to generate image %s (%s)' % image['name'])
+            LOG.warning('Unable to generate image %s (%s)',
+                        image['name'], image['format'])
             continue
         if 'generated_by' in image:
             generate_one(image, args.output)

manifest.yaml

@@ -97,6 +97,7 @@ images:
     generated_by:
       - qemu-img create -f raw %(filename)s 1M
       - mkisofs -udf -V %(name)s -o %(filename)s /etc/hosts
+    support_check: mkisofs -h 2>&1 | grep -iq udf
     description: >-
       A UDF filesystem (similar to ISO9660) with a single file inside
   - name: iso-with-qcow2-in-system
@@ -105,7 +106,7 @@ images:
     insecure: true
     generated_by:
       - qemu-img create -f raw %(filename)s 1M
-      - mkisofs -udf -V %(name)s -o %(filename)s /etc/hosts
+      - mkisofs -V %(name)s -o %(filename)s /etc/hosts
       - qemu-img create -f qcow2 tmp.qcow 10M
       - dd if=tmp.qcow of=%(filename)s bs=32k count=1 conv=notrunc
       - rm tmp.qcow