lxc: create the required directories upon driver start

/var/run may reside on a tmpfs and we fail to create the PID file if
/var/run/lxc does not exist.

Since commit 0a8addc1, the lxc driver's state directory isn't
automatically created before starting a domain. Now, the lxc driver
makes sure the state directory exists when it initializes.

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
(cherry picked from commit da33a1ac1f)

src/lxc/lxc_driver.c

@@ -1650,6 +1650,13 @@ static int lxcStateInitialize(bool privileged,
     if (!(caps = virLXCDriverGetCapabilities(lxc_driver, false)))
         goto cleanup;
 
+    if (virFileMakePath(cfg->stateDir) < 0) {
+        virReportSystemError(errno,
+                             _("Failed to mkdir %s"),
+                             cfg->stateDir);
+        goto cleanup;
+    }
+
     /* Get all the running persistent or transient configs first */
     if (virDomainObjListLoadAllConfigs(lxc_driver->domains,
                                        cfg->stateDir,