Add the `vmware/scenario/vcenter_only` alias to be able to identify the
vmware test roles that can be tested with just on vcenter instance.
Also, add a check to be sure we don't try to attach ESXi hosts if none
has been defined.
- Use predictable VM name during the tests (test_vm1, test_vm2 and
test_vm2). This to simplify the teardown of the newly created resource
before the next test.
- Update the documentation to explain the new requirement
- Avoid VM creation with `with_items` when it's not mandatory. This to:
- speed up the test execution, our hypervisors have limited resources
- simplify the teardown
- Remove `create_d1_c1_f0_env.yml`, the test was just testing how Ansible
pass environment variables.
- Correct the name for the `f0` variable (`f1`)
- Fix the DVS tests, the hosts can now reach the dvswitch1 vswitch
- Provision the VM with a poweroff status, this to improve the
idempotency and sleep up the tests
- Avoid the use of `prepare_vmware_tests` to prepare virtual machines
when we just need one machine
* Update Shippable integration test groups.
* Update integration test group aliases.
* Rebalance AWS and Azure tests with extra group.
* Rebalance Windows tests with another group.
