Updating go packages to peg against the latest AG SDK (#114)

We weren't able to use the autoscale configuration with WAF v2 since the ingress controller was using an older version of the go SDK. Moving to the latest go SDK in order to enable these configuration.

Author: akshaysngupta

cmd/appgw-ingress/main.go

@@ -11,7 +11,7 @@ import (
 	"os"
 	"time"
 
-	"github.com/Azure/azure-sdk-for-go/services/network/mgmt/2018-06-01/network"
+	"github.com/Azure/azure-sdk-for-go/services/network/mgmt/2018-12-01/network"
 	"github.com/Azure/go-autorest/autorest"
 	"github.com/Azure/go-autorest/autorest/azure/auth"
 	"github.com/golang/glog"
@@ -137,7 +137,7 @@ func getKubeClientConfig() *rest.Config {
 	}
 
 	// use the current context in kubeconfig
-	config, err := clientcmd.BuildConfigFromFlags(*apiServerHost, *kubeConfigFile)
+	config, err := clientcmd.BuildConfigFromFlags("", *kubeConfigFile)
 
 	if err != nil {
 		glog.Fatalf("error creating client configuration: %v", err.Error())

dockerfiles/devenv.Dockerfile

@@ -5,7 +5,7 @@ FROM buildpack-deps:xenial
 RUN apt-get update && apt-get -y install apt-transport-https curl
 
 # install golang
-ENV GO_VERSION 1.10.3
+ENV GO_VERSION 1.12
 RUN wget -q https://storage.googleapis.com/golang/go${GO_VERSION}.linux-amd64.tar.gz \
     && tar -C /usr/local -xzf go${GO_VERSION}.linux-amd64.tar.gz && rm go${GO_VERSION}.linux-amd64.tar.gz