Change iPXE kernel/initrd download from HTTP to HTTPS #420
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* Require an iPXE-enabled network boot environment with support for TLS downloads. PXE clients must chainload to iPXE firmware compiled with `DOWNLOAD_PROTO_HTTPS` enabled ([crypto](https://ipxe.org/crypto)) * iPXE's pre-compiled firmware binaries do _not_ enable HTTPS. Admins should build iPXE from source with support enabled * Affects the Container Linux and Flatcar Linux install profiles that pull from public downloads. No effect when cached_install=true or using Fedora Atomic, as those download from Matchbox * Add `download_protocol` variable. Recognizing boot firmware TLS support is difficult in some environments, set the protocol to "http" for the old behavior (discouraged)
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DOWNLOAD_PROTO_HTTPSenabled (crypto)download_protocolvariable. In iPXE environments lacking support, set the protocol to "http" for the old behavior (discouraged)