For caddy v1 in our org (#4018)

* For caddy v1 in our org

This RP changes all imports for caddyserver/caddy to coredns/caddy. This
is the v1 code of caddy.

For the coredns/caddy repo the following changes have been made:

* anything not needed by us is deleted
* all `telemetry` stuff is deleted
* all its import paths are also changed to point to coredns/caddy
* the v1 branch has been moved to the master branch
* a v1.1.0 tag has been added to signal the latest release

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

* Fix imports

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

* Group coredns/caddy with out plugins

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

* remove this file

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

* Relax import ordering

github.com/coredns is now also a coredns dep, this makes
github.com/coredns/caddy fit more natural in the list.

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

* Fix final import

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

plugin/dns64/setup.go

@@ -3,12 +3,11 @@ package dns64
 import (
 	"net"
 
+	"github.com/coredns/caddy"
 	"github.com/coredns/coredns/core/dnsserver"
 	"github.com/coredns/coredns/plugin"
 	clog "github.com/coredns/coredns/plugin/pkg/log"
 	"github.com/coredns/coredns/plugin/pkg/upstream"
-
-	"github.com/caddyserver/caddy"
 )
 
 const pluginName = "dns64"

plugin/dns64/setup_test.go

@@ -3,7 +3,7 @@ package dns64
 import (
 	"testing"
 
-	"github.com/caddyserver/caddy"
+	"github.com/coredns/caddy"
 )
 
 func TestSetupDns64(t *testing.T) {