Add template-version-list command to heat api

Registered by Oleksii Chuprykov

It is useful to have such command in heat api for end users.
Example:
>heat template-version-list
Possible output:
heat_template_version.2013-05-23
heat_template_version.2014-10-16
heat_template_version.2015-04-30
HeatTemplateFormatVersion.2012-12-12
AWSTemplateFormatVersion.2010-09-09

Blueprint information

Status:
Complete
Approver:
Sergey Kraynev
Priority:
Low
Drafter:
Oleksii Chuprykov
Direction:
Approved
Assignee:
Oleksii Chuprykov
Definition:
Approved
Series goal:
Accepted for liberty
Implementation:
Implemented
Milestone target:
milestone icon 5.0.0
Started by
Oleksii Chuprykov
Completed by
Oleksii Chuprykov

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