* Update Shippable integration test groups.
* Update integration test group aliases.
* Rebalance AWS and Azure tests with extra group.
* Rebalance Windows tests with another group.
* Check get_option method works with inventory plugins
This use case is already tested by some cloud inventoty plugin but
these tests are slow and aren't always executed, hence this new quick
test.
* AnsiblePlugin: Fix typo in docstring