middleware/chaos: fix version (#669)

* middleware/chaos: fix version

Move the version setting into a init function so it is done early. Then
tweak the setup code for chaos a bit to correctly pick this version up.
Add an integration test to pick this up in the toplevel test/ directory.

Fixes #667

* Update tests

coremain/run.go

@@ -50,6 +50,9 @@ func init() {
 
 	caddy.RegisterCaddyfileLoader("flag", caddy.LoaderFunc(confLoader))
 	caddy.SetDefaultCaddyfileLoader("default", caddy.LoaderFunc(defaultLoader))
+
+	caddy.AppName = coreName
+	caddy.AppVersion = coreVersion
 }
 
 // Run is CoreDNS's main() function.
@@ -57,9 +60,6 @@ func Run() {
 
 	flag.Parse()
 
-	caddy.AppName = coreName
-	caddy.AppVersion = coreVersion
-
 	// Set up process log before anything bad happens
 	switch logfile {
 	case "stdout":