Revert "Revert "Fix the race between configuring cbr0 and restarting static pods""

This reverts commit fd0a95dd12.

pkg/util/util.go

@@ -198,6 +198,20 @@ func CompileRegexps(regexpStrings []string) ([]*regexp.Regexp, error) {
 	return regexps, nil
 }
 
+// Detects if using systemd as the init system
+// Please note that simply reading /proc/1/cmdline can be misleading because
+// some installation of various init programs can automatically make /sbin/init
+// a symlink or even a renamed version of their main program.
+// TODO(dchen1107): realiably detects the init system using on the system:
+// systemd, upstart, initd, etc.
+func UsingSystemdInitSystem() bool {
+	if _, err := os.Stat("/run/systemd/system"); err != nil {
+		return true
+	}
+
+	return false
+}
+
 // Writes 'value' to /proc/<pid>/oom_score_adj. PID = 0 means self
 func ApplyOomScoreAdj(pid int, value int) error {
 	if value < -1000 || value > 1000 {