Errors and warnings when using "gcloud preview app" with appengine-helloworld-python

[aalexand]

This GAE example needs to be updated to make sure it works without warnings or errors with "gcloud preview app" deploy and run commands.

    @aalexand0:tmp.Jc8sXZ7fnr$ git clone git@github.com:GoogleCloudPlatform/appengine-helloworld-python
    Cloning into 'appengine-helloworld-python'...
    remote: Counting objects: 21, done.
    remote: Total 21 (delta 0), reused 0 (delta 0), pack-reused 21
    Receiving objects: 100% (21/21), 9.75 KiB | 0 bytes/s, done.
    Resolving deltas: 100% (5/5), done.
    Checking connectivity... done.

    @aalexand0:tmp.Jc8sXZ7fnr$ cd appengine-helloworld-python/

    @aalexand0:appengine-helloworld-python$ gcloud config set project oval-time-515 # choose your own one

    @aalexand0:appengine-helloworld-python$ gcloud preview app run ./app.yaml
    WARNING: The [application] field is specified in file [/tmp/tmp.Jc8sXZ7fnr/appengine-helloworld-python/app.yaml].  This field is not used by gcloud and should be removed.
    ...
    Command killed by keyboard interrupt

    @aalexand0:appengine-helloworld-python$ gcloud preview app deploy ./app.yaml
    WARNING: The [application] field is specified in file [/tmp/tmp.Jc8sXZ7fnr/appengine-helloworld-python/app.yaml].  This field is not used by gcloud and should be removed.
    ERROR: The application [your-app-id] declared in [/tmp/tmp.Jc8sXZ7fnr/appengine-helloworld-python/app.yaml] does not match the current gcloud project [oval-time-515].
    WARNING: The [version] field is specified in file [/tmp/tmp.Jc8sXZ7fnr/appengine-helloworld-python/app.yaml].  This field is not used by gcloud and should be removed.
    ERROR: The version [1] declared in [/tmp/tmp.Jc8sXZ7fnr/appengine-helloworld-python/app.yaml] does not match the current gcloud version [20150424t121326].
    ERROR: (gcloud.preview.app.deploy) Errors occurred while parsing the App Engine app configuration.