Added plugin imports in cmds/coredhcp

New plugins have been added but not imported in cmds/coredhcp.

Signed-off-by: Andrea Barberio <insomniac@slackware.it>

cmds/coredhcp/main.go

@@ -6,7 +6,11 @@ import (
 	"github.com/coredhcp/coredhcp"
 	"github.com/coredhcp/coredhcp/config"
 	"github.com/coredhcp/coredhcp/logger"
+	_ "github.com/coredhcp/coredhcp/plugins/dns"
 	_ "github.com/coredhcp/coredhcp/plugins/file"
+	_ "github.com/coredhcp/coredhcp/plugins/netmask"
+	_ "github.com/coredhcp/coredhcp/plugins/range"
+	_ "github.com/coredhcp/coredhcp/plugins/router"
 	_ "github.com/coredhcp/coredhcp/plugins/server_id"
 )