Added support for sub deployment_map files

[triha74]

Issue #78:

Description of changes: Added support for loading deployment_map files form a deployment_map dir.

The code loads deployment_map.yml then if there is a deployment_map dir and it has content it loads any yml files in there. The deployment_map/*.yml follow the exact same format as the deployment_map.yml. The loaded subfiles are merged with the pipelines list of the deployment_map.yml. If there was not deployment_map.yml it creates an empty pipelines array that it subsquently fills with content from subfiles.

Example 1.

RihaDevTeam:~/environment/adf/deploy/aws-deployment-framework-pipelines (master) $ ls
adf-build  deployment_map  deployment_map.yml  pipeline_types  pytest.ini
RihaDevTeam:~/environment/adf/deploy/aws-deployment-framework-pipelines (master) $ 
RihaDevTeam:~/environment/adf/deploy/aws-deployment-framework-pipelines (master) $ ls deployment_map
example-lib-python.yml       example-service-authentication.yml
example-service-dynamo.yml   example-service-dynamo.yml

Example 2.

RihaDevTeam:~/environment/adf/deploy/aws-deployment-framework-pipelines (master) $ ls
adf-build  deployment_map  deployment_map.yml  pipeline_types  pytest.ini
RihaDevTeam:~/environment/adf/deploy/aws-deployment-framework-pipelines (master) $ 
RihaDevTeam:~/environment/adf/deploy/aws-deployment-framework-pipelines (master) $ ls deployment_map
team-alpha.yml             team-beta.yml

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[bundyfx]

what if we called the folder "maps" or "deployment_maps" since it will probably hold multiple

[bundyfx]

Thanks! Merged! 💯 - will go into the 1.10 bundle on the SAR which should be up by tomorrow.