* Update Shippable integration test groups.
* Update integration test group aliases.
* Rebalance AWS and Azure tests with extra group.
* Rebalance Windows tests with another group.
* added integration tests for yum repository
* fixed escaped single quote
* extended yum_repository tests to include fedora
* removed unused variable file
* added check for return values
* replaced escaped double quotes with single quotes, switched to lookup for reading repofile