Replace more cases of /system with /machine

The change in commit aed49863
was incomplete, missing a couple of cases of /system. This
caused failure to start VMs.
Signed-off-by: NDaniel P. Berrange <berrange@redhat.com>

src/lxc/lxc_cgroup.c

@@ -557,7 +557,7 @@ virCgroupPtr virLXCCgroupCreate(virDomainDefPtr def, bool startup)
         /* We only auto-create the default partition. In other
          * cases we expec the sysadmin/app to have done so */
         rc = virCgroupNewPartition(def->resource->partition,
-                                   STREQ(def->resource->partition, "/system"),
+                                   STREQ(def->resource->partition, "/machine"),
                                    -1,
                                    &parent);
         if (rc != 0) {

src/qemu/qemu_cgroup.c

@@ -256,7 +256,7 @@ int qemuInitCgroup(virQEMUDriverPtr driver,
         /* We only auto-create the default partition. In other
          * cases we expec the sysadmin/app to have done so */
         rc = virCgroupNewPartition(vm->def->resource->partition,
-                                   STREQ(vm->def->resource->partition, "/system"),
+                                   STREQ(vm->def->resource->partition, "/machine"),
                                    cfg->cgroupControllers,
                                    &parent);
         if (rc != 0) {