qemustatusxml2xml: Remove obsolete 'json' attribute

We no longer support HMP-only qemus. Remove the leftover attribute from
the test files.

Signed-off-by: Peter Krempa <pkrempa@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>

tests/qemustatusxml2xmldata/migration-out-nbd-in.xml

@@ -1,6 +1,6 @@
 <domstatus state='running' reason='booted' pid='15433'>
   <taint flag='high-privileges'/>
-  <monitor path='/var/lib/libvirt/qemu/domain-4-upstream/monitor.sock' json='1' type='unix'/>
+  <monitor path='/var/lib/libvirt/qemu/domain-4-upstream/monitor.sock' type='unix'/>
   <vcpus>
     <vcpu id='0' pid='15449'/>
     <vcpu id='1' pid='15450'/>

tests/qemustatusxml2xmldata/migration-out-nbd-tls-in.xml

@@ -1,6 +1,6 @@
 <domstatus state='running' reason='booted' pid='68472'>
   <taint flag='high-privileges'/>
-  <monitor path='/var/lib/libvirt/qemu/domain-3-upstream/monitor.sock' json='1' type='unix'/>
+  <monitor path='/var/lib/libvirt/qemu/domain-3-upstream/monitor.sock' type='unix'/>
   <namespaces>
     <mount/>
   </namespaces>

tests/qemustatusxml2xmldata/upgrade-in.xml

@@ -1,5 +1,5 @@
 <domstatus state='running' reason='booted' pid='195139'>
-  <monitor path='/var/lib/libvirt/qemu/domain-1-upstream/monitor.sock' json='1' type='unix'/>
+  <monitor path='/var/lib/libvirt/qemu/domain-1-upstream/monitor.sock' type='unix'/>
   <namespaces>
     <mount/>
   </namespaces>