Update Caddy to 1.0.1, and update import path (#2961)

* Update Caddy to 1.0.1, and update import path

This fix updates caddy to 1.0.1 and also
updates the import path to github.com/caddyserver/caddy

This fix fixes 2959

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Also update plugin.cfg

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

* Update and bump zplugin.go

Signed-off-by: Yong Tang <yong.tang.github@outlook.com>

test/chaos_test.go

@@ -6,7 +6,7 @@ import (
 	// Plug in CoreDNS, needed for AppVersion and AppName in this test.
 	_ "github.com/coredns/coredns/coremain"
 
-	"github.com/mholt/caddy"
+	"github.com/caddyserver/caddy"
 	"github.com/miekg/dns"
 )
 

test/readme_test.go

@@ -10,7 +10,7 @@ import (
 
 	"github.com/coredns/coredns/core/dnsserver"
 
-	"github.com/mholt/caddy"
+	"github.com/caddyserver/caddy"
 )
 
 // As we use the filesystem as-is, these files need to exist ON DISK for the readme test to work. This is especially

test/server.go

@@ -8,7 +8,7 @@ import (
 	// Hook in CoreDNS.
 	_ "github.com/coredns/coredns/core"
 
-	"github.com/mholt/caddy"
+	"github.com/caddyserver/caddy"
 )
 
 var mu sync.Mutex