Clean up chardev sockets on QEMU shutdown

https://bugzilla.redhat.com/show_bug.cgi?id=1088787

Clean up unix socket files for chardevs using mode='bind',
like we clean up the monitor socket.
They are created by QEMU on startup and not really useful
after shutting it down.

src/qemu/qemu_process.c

@@ -2659,6 +2659,19 @@ qemuProcessPrepareChardevDevice(virDomainDefPtr def ATTRIBUTE_UNUSED,
 }
 
 
+static int
+qemuProcessCleanupChardevDevice(virDomainDefPtr def ATTRIBUTE_UNUSED,
+                                virDomainChrDefPtr dev,
+                                void *opaque ATTRIBUTE_UNUSED)
+{
+    if (dev->source.type == VIR_DOMAIN_CHR_TYPE_UNIX &&
+        dev->source.data.nix.listen)
+        unlink(dev->source.data.nix.path);
+
+    return 0;
+}
+
+
 struct qemuProcessHookData {
     virConnectPtr conn;
     virDomainObjPtr vm;
@@ -4353,6 +4366,12 @@ void qemuProcessStop(virQEMUDriverPtr driver,
         priv->monConfig = NULL;
     }
 
+    ignore_value(virDomainChrDefForeach(vm->def,
+                                        false,
+                                        qemuProcessCleanupChardevDevice,
+                                        NULL));
+
+
     /* shut it off for sure */
     ignore_value(qemuProcessKill(vm,
                                  VIR_QEMU_PROCESS_KILL_FORCE|