cgfs: prune the init scope from paths

Just as cgmanager does, if we are calculating a task's paths, drop
the trailing '/init.scope'.  We don't want the container to sit under
there.

Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>

src/lxc/cgfs.c

@@ -1662,6 +1662,7 @@ lxc_cgroup_process_info_getx(const char *proc_pid_cgroup_str,
 		entry->cgroup_path = strdup(colon2);
 		if (!entry->cgroup_path)
 			goto out_error;
+		prune_init_scope(entry->cgroup_path);
 
 		*cptr = entry;
 		cptr = &entry->next;