Fix main startup (#232)

Set version and name of the program. And then call coremain.Run().

The coremain split makes CoreDNS embeddable.

Also see #189 for an old PR.

coredns.go

@@ -1,31 +1,7 @@
 package main
 
-import (
-	"flag"
-
-	"github.com/mholt/caddy"
-	"github.com/mholt/caddy/caddy/caddymain"
-)
-
-//go:generate go run plugin_generate.go
+import "github.com/miekg/coredns/coremain"
 
 func main() {
-	setFlag()
-	setName()
-
-	caddymain.Run()
+	coremain.Run()
 }
-
-// setFlag sets flags to predefined values for CoreDNS.
-func setFlag() {
-	flag.Set("type", "dns")
-}
-
-// setName sets application name and versioning information for CoreDNS.
-func setName() {
-	caddy.DefaultConfigFile = "Corefile"
-	caddy.AppName = "CoreDNS"
-	caddy.AppVersion = version
-}
-
-const version = "001"