8ff83f2f1a
This "breaks" the use case of receiving an unencrypted send into an encrypted receiver by setting the receiver's `root_fs`'s `encryption=on`. "breaks" in air-quotes because we have not yet released a version of zrepl with encrypted send support. We will bring back the featured outlined above in a future release. See https://github.com/zrepl/zrepl/issues/342#issuecomment-657231818 and following.