Michael Vogt 34b9607e4e varlink: use single byte reads on SD_VARLINK_SERVER_UPGRADABLE
When the server side of a varlink connection supports connection
upgrades we need to go into single byte-read mode to avoid the
risk of a client that sends the json to protocol upgrade and then
immediately the custom protocol payload. This commit implements
this.

The next step is using MSG_PEEK to avoid the single-byte overhead.
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Systemd

System and Service Manager

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