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app: support ipxe variables in ipxe scripts

clayton craft requested to merge craftyguy/valve-infra:ipxe_cmdline into master

This uses Template.safe_substitution to support ipxe variables in ipxe boot scripts. ipxe variables are dereferenced the same way as variables in ipxe-boot-server (e.g. "${foo}"), and using safe_substitution allows undefined/unknown variables in the params map to be passed through unmodified. When Template.substitution was used, any unknown (to this app) variables, like for ipxe, were removed from the output.

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