Do not deploy to AppEngine in Presubmit (GoogleCloudPlatform#659)

Author: fhinkel

.kokoro/debugger.cfg

@@ -9,5 +9,5 @@ env_vars: {
 # Tell the trampoline which build file to use.
 env_vars: {
  key: "TRAMPOLINE_BUILD_FILE"
- value: "github/nodejs-docs-samples/.kokoro/build-with-appengine.sh"
+ value: "github/nodejs-docs-samples/.kokoro/build.sh"
 }

.kokoro/trace.cfg

@@ -9,5 +9,5 @@ env_vars: {
 # Tell the trampoline which build file to use.
 env_vars: {
  key: "TRAMPOLINE_BUILD_FILE"
- value: "github/nodejs-docs-samples/.kokoro/build-with-appengine.sh"
+ value: "github/nodejs-docs-samples/.kokoro/build.sh"
 }