Set InterpolateContext #97
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Setting the InterpolateContext fills out config.ctx in the builder to be passed into the steps that require it. For example, this allows user variables in the boot_command to be interpolated correctly.
Fixes #93.
This is how the core Hyper-V builder works: https://github.com/hashicorp/packer/blob/master/builder/hyperv/iso/builder.go#L108-L116