Update AKS base image to 0.17.0 (#3949)

Adds support binaries for Kubernetes 2.0.0 and 1.9.11.

pkg/acsengine/defaults.go

@@ -113,7 +113,7 @@ var (
 		ImageOffer:     "aks",
 		ImageSku:       "aksbase",
 		ImagePublisher: "microsoft-aks",
-		ImageVersion:   "0.16.0",
+		ImageVersion:   "0.17.0",
 	}
 
 	//DefaultOpenShift39RHELImageConfig is the OpenShift on RHEL distribution.