FEATURE REQUEST: add {{packer_version}} function

[tamsky]

Add a new function {{packer_version}} which yields the current packer version string, eg: 1.1.0.

This would allow users to apply this value to resulting build artifacts -- which helps users correlate the version of packer that built the artifacts.

Documentation that would need updating:

• https://www.packer.io/docs/templates/engine.html#functions

Source files that would need changes:

• https://github.com/hashicorp/packer/blob/master/template/interpolate/funcs.go
• https://github.com/hashicorp/packer/blob/master/template/interpolate/funcs_test.go

[mwhooker]

seems good. If you want to give adding it a shot, I can review

[tamsky]

Cool. Thanks for looking.
I did plan to give it a go... but probably not until late next week.

[ghost]

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