Fix kokoro config (#662)

Allowed values are standard and flex. Use them for the version.
Always deploy app.yaml, so don't specify it.

Author: fhinkel

.kokoro/appengine/test-deployment/common.cfg

@@ -19,11 +19,4 @@ env_vars: {
 env_vars: {
     key: "TRAMPOLINE_BUILD_FILE"
     value: "github/nodejs-docs-samples/.kokoro/build-with-appengine.sh"
-}
-
-
-# Used in `gcloud app deploy ${APPENGINE_ENVIRONMENT}.yaml
-env_vars: {
-    key: "APPENGINE_ENVIRONMENT"
-    value: "app"
 }

.kokoro/appengine/test-deployment/hello-world-flex.cfg

@@ -4,4 +4,10 @@
 env_vars: {
     key: "PROJECT"
     value: "appengine/hello-world/flexible"
+}
+
+# flexible or standard
+env_vars: {
+    key: "APPENGINE_ENVIRONMENT"
+    value: "flexible"
 }

.kokoro/appengine/test-deployment/hello-world-standard.cfg

@@ -4,4 +4,10 @@
 env_vars: {
     key: "PROJECT"
     value: "appengine/hello-world/standard"
+}
+
+# flexible or standard
+env_vars: {
+    key: "APPENGINE_ENVIRONMENT"
+    value: "standard"
 }

.kokoro/appengine/test-deployment/metadata-flex.cfg

@@ -4,4 +4,10 @@
 env_vars: {
     key: "PROJECT"
     value: "appengine/metadata/flexible"
+}
+
+# flexible or standard
+env_vars: {
+    key: "APPENGINE_ENVIRONMENT"
+    value: "flexible"
 }

.kokoro/appengine/test-deployment/metadata-standard.cfg

@@ -4,4 +4,10 @@
 env_vars: {
     key: "PROJECT"
     value: "appengine/metadata/standard"
+}
+
+# flexible or standard
+env_vars: {
+    key: "APPENGINE_ENVIRONMENT"
+    value: "standard"
 }

.kokoro/appengine/test-deployment/storage-flex.cfg

@@ -4,4 +4,10 @@
 env_vars: {
     key: "PROJECT"
     value: "appengine/storage/flexible"
+}
+
+# flexible or standard
+env_vars: {
+    key: "APPENGINE_ENVIRONMENT"
+    value: "flexible"
 }

.kokoro/appengine/test-deployment/storage-standard.cfg

@@ -4,4 +4,10 @@
 env_vars: {
     key: "PROJECT"
     value: "appengine/storage/standard"
+}
+
+# flexible or standard
+env_vars: {
+    key: "APPENGINE_ENVIRONMENT"
+    value: "standard"
 }

.kokoro/build-with-appengine.sh

@@ -48,7 +48,7 @@ gcloud config set project $GCLOUD_PROJECT
 
 
 # Deploy the app
-gcloud app deploy ${APPENGINE_ENVIRONMENT}.yaml --version $GAE_VERSION --no-promote --quiet
+gcloud app deploy --version $GAE_VERSION --no-promote --quiet
 if [ -e "worker.yaml" ]; then
   gcloud app deploy worker.yaml --version ${GAE_VERSION} --no-promote --quiet
 fi