Add prometheus container level metrics

Signed-off-by: Michael Crosby <crosbymichael@gmail.com>

vendor/github.com/crosbymichael/cgroups/ticks.go

@@ -0,0 +1,10 @@
+package cgroups
+
+/*
+#include <unistd.h>
+*/
+import "C"
+
+func getClockTicks() uint64 {
+	return uint64(C.sysconf(C._SC_CLK_TCK))
+}