test: Test skeleton diagram and integrations tests for module vmseries

[sebastianczech]

Description

PR delivers integrations tests for vmseries module and additional diagram (as a code) presenting how test skeleton works:

graph TB
    terraform_options(Init Terraform with provided options)
    terraform_apply(Deploy infrastructure)
    do_terraform_plan_after_deploy{Execute Terraform Plan?}
    terraform_plan_after_deploy(Verify if no changes are planned after deployment)
    do_modify_infrastructure{Modify infrastructure?}
    modify_infrastructure(Plan infrastructure with changed resources)
    verify_changes(Verify planned changes)
    terraform_apply_changes(Deploy infrastructure with changed resources)
    verify_assert_expression(Verify assert expressions)
    terraform_destroy(Destroy infrastructure)
    test_fail((Tests failed))
    test_pass((Tests passed))

    terraform_options --> terraform_apply -- infrastructure is deployed --> verify_assert_expression
    do_terraform_plan_after_deploy -- yes --> terraform_plan_after_deploy
    terraform_plan_after_deploy -- code is idempotent --> do_modify_infrastructure
    verify_assert_expression -- all asserts passed --> do_terraform_plan_after_deploy
    do_modify_infrastructure -- yes --> modify_infrastructure --> verify_changes
    verify_changes -- only expected changes --> terraform_apply_changes
    terraform_apply -. error in deployment .-> test_fail
    terraform_plan_after_deploy -. code is not idempotent .-> test_fail
    verify_assert_expression -. one of the asserts failed .-> test_fail
    verify_changes -. unexpected changes .-> test_fail
    terraform_apply_changes -. error in deployment .-> test_fail
    do_terraform_plan_after_deploy -- no --> test_pass
    do_modify_infrastructure -- no --> test_pass
    terraform_apply_changes -- infrastructure is deployed --> test_pass
    test_fail -..-> terraform_destroy
    test_pass ----> terraform_destroy

    classDef green fill:#33aa33,stroke:#333,stroke-width:2px;
    classDef red fill:#aa3333,stroke:#333,stroke-width:2px;
    class test_pass green
    class test_fail red

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Motivation and Context

#261

How Has This Been Tested?

Code was tested by Terratest.

Types of changes

• New feature (non-breaking change which adds functionality)

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.