- One unique file to list all dependencies and dependencies' versions (except Go, currently defined in `build/Dockerfile`).
- Custom versions can now be injected into Vagrant VMs.
- Vagrant dev VMs, Vagrant test VMs, and `run-integration-tests.sh` all source from `DEPENDENCIES`, to keep things 'DRY'.
- Vagrant versions can be overriden using environment variables, like it was possible in `run-integration-tests.sh`.
This should be useful when we just want to type one make integration-tests / ./run-integration-tests command to make/start VMs/configure them/test, but also investigate potential failures afterwards.
This should make development easier by allowing developers to set HOSTS in their calling shell, and re-use the value for this env. var. when calling individual test scripts, e.g.:
```
cd test
eval $(./run-integration-tests.sh setup)
./200_dns_test.sh
```
CircleCI keeps 10 nodes in order to speed up the build, but the default is 3, as this is the minimum required to run any test. This should make more sense as a default for a developer to quickly start an environment and iterate.
Provisioning and configuration being expensive time-wise, we create Google Cloud Platform images for each Docker/Kubernetes/Kubernetes CNI versions triple, and configure these once (instead of for each build), and then re-use these in subsequent builds, effectively implementing a 'cache' of images.
Marc CARRE