Implement get_artifact function

Registered by Sahdev Zala

The get_artifact function is used to retrieve artifact location between modelable entities defined in the same service template, as an

get_artifact: [ <modelable_entity_name>, <artifact_name>, <location>, <remove> ]

Refer to the spec for more detail,
http://docs.oasis-open.org/tosca/TOSCA-Simple-Profile-YAML/v1.0/csprd01/TOSCA-Simple-Profile-YAML-v1.0-csprd01.html#_Toc430015727

Implement function with new example/test templates.

Blueprint information

Status:
Not started
Approver:
Sahdev Zala
Priority:
High
Drafter:
Sahdev Zala
Direction:
Needs approval
Assignee:
None
Definition:
Approved
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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