* Fix azure_rm_acs due to Azure breaking API change
* resolve code review feedbacks
* resolve test failures
* better name
* ignore case for vm size
* reformat code
* resolve code review feedbacks
* Add openssh-client to default docker container.
* Include Azure requirements in default container.
To do so, handling of pip requirements was updated to install each
set of requirements separately and then run a verification pass to
make sure there are no conflicts between requirements.
* Add missing --docker-no-pull option.
* Add documentation for the azure-requirements test.