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.
There may be situations when Terraform/Ansible/etc. fail to provision test machines.
In these cases, we want to fail fast instead of waiting until we time out in circle-test-pre and circle-test-smoke.
This way, Vagrant VMs and cloud-provided VMs are configured in the exact same way, hence avoiding configuration drift and subtle bugs associated to different versions of software.
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.
Reason: test is periodically failing because of the timeout being too aggressive, especially when using Google Cloud Platform together with Terraform and Ansible.
If building against the latest 'build-tools', you would typically get:
tools/runner/runner.go:18:2: cannot find package github.com/weaveworks/common/mflag
This change fixes the issue by upgrading both dependencies.
Makes what the build does explicitly and helps for potential debugging.
Also reminds us that we are skipping these files, so that we ultimately shfmt them and stop lint-ignoring them.
Previous commit upgrades Weave Net to the latest version of `build-tools`.
However, `./tools/test`'s default behaviour has changed, so we need to explicitly pass new options/arguments, in order to keep it behaving like before fd568682c3.
Marc CARRE