Change default resource partition to /machine

After discussions with systemd developers it was decided that
a better default policy for resource partitions is to have
3 default partitions at the top level

   /system   - system services
   /machine - virtual machines / containers
   /user    - user login session

This ensures that the default policy isolates guest from
user login sessions & system services, so a mis-behaving
guest can't consume 100% of CPU usage if other things are
contending for it.

Thus we change the default partition from /system to
/machine

Signed-off-by: Daniel P. Berrange <berrange@redhat.com>

src/lxc/lxc_cgroup.c

@@ -537,7 +537,7 @@ virCgroupPtr virLXCCgroupCreate(virDomainDefPtr def, bool startup)
             goto cleanup;
         }
 
-        if (!(res->partition = strdup("/system"))) {
+        if (!(res->partition = strdup("/machine"))) {
             virReportOOMError();
             VIR_FREE(res);
             goto cleanup;

src/qemu/qemu_cgroup.c

@@ -236,7 +236,7 @@ int qemuInitCgroup(virQEMUDriverPtr driver,
             goto cleanup;
         }
 
-        if (!(res->partition = strdup("/system"))) {
+        if (!(res->partition = strdup("/machine"))) {
             virReportOOMError();
             VIR_FREE(res);
             goto cleanup;