plugin register (#3321)

These plugins where missed in #3287 because their setup is done in a file
other than setup.go
Signed-off-by: Miek Gieben <miek@miek.nl>

plugin/bind/bind.go

 // Package bind allows binding to a specific interface instead of bind to all of them.
 package bind
 
-import "github.com/caddyserver/caddy"
+import "github.com/coredns/coredns/plugin"
 
-func init() {
-	caddy.RegisterPlugin("bind", caddy.Plugin{
-		ServerType: "dns",
-		Action:     setup,
-	})
-}
+func init() { plugin.Register("bind", setup) }

plugin/cancel/cancel.go

@@ -13,12 +13,7 @@ import (
 	"github.com/miekg/dns"
 )
 
-func init() {
-	caddy.RegisterPlugin("cancel", caddy.Plugin{
-		ServerType: "dns",
-		Action:     setup,
-	})
-}
+func init() { plugin.Register("cancel", setup) }
 
 func setup(c *caddy.Controller) error {
 	ca := Cancel{timeout: 5001 * time.Millisecond}

plugin/debug/debug.go

@@ -7,12 +7,7 @@ import (
 	"github.com/caddyserver/caddy"
 )
 
-func init() {
-	caddy.RegisterPlugin("debug", caddy.Plugin{
-		ServerType: "dns",
-		Action:     setup,
-	})
-}
+func init() { plugin.Register("debug", setup) }
 
 func setup(c *caddy.Controller) error {
 	config := dnsserver.GetConfig(c)

plugin/root/root.go

@@ -12,12 +12,7 @@ import (
 
 var log = clog.NewWithPlugin("root")
 
-func init() {
-	caddy.RegisterPlugin("root", caddy.Plugin{
-		ServerType: "dns",
-		Action:     setup,
-	})
-}
+func init() { plugin.Register("root", setup) }
 
 func setup(c *caddy.Controller) error {
 	config := dnsserver.GetConfig(c)

plugin/tls/tls.go

@@ -10,12 +10,7 @@ import (
 	"github.com/caddyserver/caddy"
 )
 
-func init() {
-	caddy.RegisterPlugin("tls", caddy.Plugin{
-		ServerType: "dns",
-		Action:     setup,
-	})
-}
+func init() { plugin.Register("tls", setup) }
 
 func setup(c *caddy.Controller) error {
 	err := parseTLS(c)