Better naming (#2104)

* Move functions from pkg/transport to pkg/parse

Although "parse" is a fairly generic name I believe this is somewhat
better named. pkg/transport keeps a few constants that are uses
throughout for the rest is is renaming a bunch (and the fallout from
there to make things compile again).

Signed-off-by: Miek Gieben <miek@miek.nl>

* Fix tests

Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/normalize.go

@@ -6,8 +6,7 @@ import (
 	"strconv"
 	"strings"
 
-	"github.com/coredns/coredns/plugin/pkg/transport"
-
+	"github.com/coredns/coredns/plugin/pkg/parse"
 	"github.com/miekg/dns"
 )
 
@@ -64,7 +63,7 @@ type (
 // of any port or transport. The host will also be fully qualified and lowercased.
 func (h Host) Normalize() string {
 	s := string(h)
-	_, s = transport.Parse(s)
+	_, s = parse.Transport(s)
 
 	// The error can be ignore here, because this function is called after the corefile has already been vetted.
 	host, _, _, _ := SplitHostPort(s)