Implement intrinsic functions concate and token

Registered by Sahdev Zala

Provide support for intrinsic functions,
1. Concat
The concat function is used to concatenate two or more string values within a TOSCA service template.
2. Token
The token function is used within a TOSCA service template on a string to parse out (tokenize) substrings separated by one or more token characters within a larger string.

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#_Toc430015714

Blueprint information

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

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