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, 6 deletions

diff --git a/middleware/file/tree/elem.go b/middleware/file/tree/elem.go
index 6785a6849..785d64660 100644
--- a/middleware/file/tree/elem.go
+++ b/middleware/file/tree/elem.go
@@ -1,9 +1,6 @@
 package tree
 
-import (
-	"github.com/miekg/coredns/middleware"
-	"github.com/miekg/dns"
-)
+import "github.com/miekg/dns"
 
 type Elem struct {
 	m map[uint16][]dns.RR
@@ -91,8 +88,8 @@ func (e *Elem) Delete(rr dns.RR) (empty bool) {
 	return
 }
 
-// Less is a tree helper function that calls middleware.Less.
-func Less(a *Elem, name string) int { return middleware.Less(name, a.Name()) }
+// Less is a tree helper function that calls less.
+func Less(a *Elem, name string) int { return less(name, a.Name()) }
 
 // Assuming the same type and name this will check if the rdata is equal as well.
 func equalRdata(a, b dns.RR) bool {