builder/hyperv/iso: missing InterpolateContext

[tsmolka]

I believe there is a trivial error in hyper-iso builder where context for interpolation is not set properly. This causes boot_command not to interpolate user variables and fail with similar errors:

Build 'hyperv-iso' errored: Error preparing boot command: template: root:1:3: executing "root" at <user `boot_command_p...>: error calling user: test

I have seen few references to what appears to be similar issue:

• https://groups.google.com/forum/#!topic/packer-tool/MESGmUT6_1I
• https://pastebin.com/d5HysARA

The proposed change fixed interpolation issue for me.

[mwhooker]

if you can fix the test (just need to gofmt the code) I think we can merge this in

[tsmolka]

thanks, formatting fixed

[ghost]

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