Support to list sections of template

Registered by huangtianhua

There is no possibility to get the sections that are supported by the given template version. Support to list sections of template is useful for helping template writers.
This bp will add a REST API, something like this:
heat template-section-list AWSTemplateFormatVersion.2010-09-09
template_sections:
 'AWSTemplateFormatVersion',
 'HeatTemplateFormatVersion',
 'Description',
 'Mappings',
 'Parameters',
 'Resources',
 'Outputs'

Blueprint information

Status:
Not started
Approver:
None
Priority:
Undefined
Drafter:
huangtianhua
Direction:
Needs approval
Assignee:
huangtianhua
Definition:
New
Series goal:
None
Implementation:
Unknown
Milestone target:
None

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