snapshots: Handle XML chars in snapshot name (bz 1468912)

https://bugzilla.redhat.com/show_bug.cgi?id=1468912

tests/testdriver.xml

@@ -1094,7 +1094,7 @@ ba</description>
 </test:domainsnapshot>
 
 <test:domainsnapshot>
-  <name>internal-root-child1</name>
+  <name>internal-root-child1&amp;</name>
   <state>running</state>
   <parent>
     <name>internal-root</name>

virtManager/snapshots.py

@@ -233,7 +233,7 @@ class vmmSnapshotPage(vmmGObjectUI):
         for snap in snapshots:
             desc = snap.get_xmlobj().description
             name = snap.get_name()
-            state = util.xml_escape(snap.run_status())
+            state = snap.run_status()
             if snap.is_external():
                 has_external = True
                 sortname = "3%s" % name
@@ -244,7 +244,8 @@ class vmmSnapshotPage(vmmGObjectUI):
                 sortname = "1%s" % name
 
             label = "%s\n<span size='small'>%s: %s%s</span>" % (
-                (name, _("VM State"), state, external))
+                (util.xml_escape(name), _("VM State"),
+                 util.xml_escape(state), external))
             model.append([name, label, desc, snap.run_status_icon_name(),
                           sortname, snap.is_current()])