[#2673] Fix deployment from CI
[#2673] Fix deployment from CI

- We need to place appengine-web.xml under WEB-INF before we can
  _stage_ the application. Otherwise AppCfg detects the application
  as a _flexible_ environment.

akvo/akvo-flow,akvo/akvo-flow,akvo/akvo-flow,akvo/akvo-flow,akvo/akvo-flow