[gae.py] Update to support MVMs.
[gae.py] Update to support MVMs.

Even though they're on the path to deprecation, LogDog currently deploys
against Managed VMs. Until we can move off this architecture, this
allows "gae.py" to deploy LogDog instances.

Additionally, include "dispatch.yaml" with the updated YAMLs.

BUG=None
TEST=local
  - Deployed LogDog w/ updated "gae.py".

Review-Url: https://codereview.chromium.org/2988133003

luci/luci-py,luci/luci-py,luci/luci-py,luci/luci-py