Cleanup: put middleware helper functions in pkgs (#245)

Move all (almost all) Go files in middleware into their
own packages. This makes for better naming and discoverability.

Lot of changes elsewhere to make this change.

The middleware.State was renamed to request.Request which is better,
but still does not cover all use-cases. It was also moved out middleware
because it is used by `dnsserver` as well.

A pkg/dnsutil packages was added for shared, handy, dns util functions.

All normalize functions are now put in normalize.go

1 files changed, 3 insertions, 2 deletions

diff --git a/middleware/etcd/handler.go b/middleware/etcd/handler.go
index 132dba370..40f9523f0 100644
--- a/middleware/etcd/handler.go
+++ b/middleware/etcd/handler.go
@@ -5,6 +5,7 @@ import (
 
 	"github.com/miekg/coredns/middleware"
 	"github.com/miekg/coredns/middleware/etcd/msg"
+	"github.com/miekg/coredns/request"
 
 	"github.com/miekg/dns"
 	"golang.org/x/net/context"
@@ -12,7 +13,7 @@ import (
 
 func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (int, error) {
 	opt := Options{}
-	state := middleware.State{W: w, Req: r}
+	state := request.Request{W: w, Req: r}
 	if state.QClass() != dns.ClassINET {
 		return dns.RcodeServerFailure, fmt.Errorf("can only deal with ClassINET")
 	}
@@ -115,7 +116,7 @@ func (e *Etcd) ServeDNS(ctx context.Context, w dns.ResponseWriter, r *dns.Msg) (
 }
 
 // Err write an error response to the client.
-func (e *Etcd) Err(zone string, rcode int, state middleware.State, debug []msg.Service, err error, opt Options) (int, error) {
+func (e *Etcd) Err(zone string, rcode int, state request.Request, debug []msg.Service, err error, opt Options) (int, error) {
 	m := new(dns.Msg)
 	m.SetRcode(state.Req, rcode)
 	m.Authoritative, m.RecursionAvailable, m.Compress = true, true, true