Add cdp support for xpath scrapers (#625)

Co-authored-by: WithoutPants <53250216+WithoutPants@users.noreply.github.com>

vendor/github.com/knq/sysutil/sysutil.go

@@ -0,0 +1,15 @@
+package sysutil
+
+import "time"
+
+var btime time.Time
+
+// BootTime returns the time the system was started.
+func BootTime() time.Time {
+	return btime
+}
+
+// Uptime returns the duration the system has been up.
+func Uptime() time.Duration {
+	return time.Now().Sub(btime)
+}