Use long options for the ESP config (GoogleCloudPlatform#514)

For better readability, use long name options for the ESP config. Doc is here: https://cloud.google.com/endpoints/docs/openapi/specify-proxy-startup-options

Author: navinger

endpoints/getting-started/deployment.yaml

@@ -42,10 +42,10 @@ spec:
       - name: esp
         image: gcr.io/endpoints-release/endpoints-runtime:1
         args: [
-          "-p", "8081",
-          "-a", "127.0.0.1:8080",
-          "-s", "SERVICE_NAME",
-          "-v", "SERVICE_VERSION",
+          "--http_port", "8081",
+          "--backend", "127.0.0.1:8080",
+          "--service", "SERVICE_NAME",
+          "--version", "SERVICE_VERSION",
         ]
       # [END esp]
         ports: