MPR-777 Add a per-SteamClient unique identifier message to DebugLog messages (2)

[javasteam-bot[bot]]

A new PR was merged over at SteamKit. It should be checked if it's relevant for JavaSteam or not.

Merged at 2019-11-04T11:03:11Z Head over to the PRs to see more details. (no direct links to avoid reference spamming).