qemu: blockjob: Introduce "broken" block job type

To better track jobs we couldn't parse let's introduce a new job type
which will clarify semantics internally in few places.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Cole Robinson <crobinso@redhat.com>

tests/qemustatusxml2xmldata/blockjob-blockdev-in.xml

@@ -300,6 +300,7 @@
         </source>
       </src>
     </blockjob>
+    <blockjob name='broken-test' type='broken' state='ready' brokentype='commit'/>
     <blockjob name='test-orphan-job0' type='copy' state='ready'>
       <chains>
         <disk type='file' format='qcow2'>