Check all subsystems, not just the first one and require one

Author: mback2k

process.go

@@ -53,9 +53,11 @@ func checkCGroup(pid int, cgroup string) bool {
 						return false
 					}
 				}
-				return true
 			}
 		}
+		if len(subsystems) > 0 {
+			return true
+		}
 	}
 	return false
 }