Commits on May 27, 2020

1. Rework for syslog version 5. This is a breaking change. …

   The `syslog` crate underwent extensive API refactoring between versions 3 and 5. This commit rewrites much of `slog-syslog` to fit the new API. It is partially compatible with previous versions of `slog-syslog` (`examples/syslog-unix.rs` still works without modification), but the shape of `Streamer3164` in particular is quite different.
   
   There are also some new features:
   
   * All `SyslogBuilder` settings are now optional and have sensible defaults. Simply running `SyslogBuilder::new().start()` will yield a usable `Drain` (if there is a syslog daemon on the local machine).
   
   * `SyslogBuilder` no longer requires a hostname to be supplied when choosing a transport (TCP, UDP, Unix socket). Instead, the hostname is a separate setting (`SyslogBuilder::hostname`), and if none is provided, it's discovered (if possible) using the `hostname` crate.
   
   * `Streamer3164` no longer contains a mutex, and is not thread-safe (that is, it is no longer `Sync`). This improves performance when used with slog-async, which doesn't need the underlying `Drain` to be thread-safe. `slog::Logger` does require the underlying `Drain` to be thread-safe, so `SyslogBuilder::start` now returns a `Streamer3164` wrapped in a `Mutex`, and there's now a `SyslogBuilder::start_single_threaded` method that returns an unwrapped `Streamer3164` instead.
   
   * Key-value pairs attached to logging records are now, by default, formatted in a style that resembles RFC 5424 STRUCTURED-DATA. Their formatting can be customized by implementing the `MsgFormat3164` trait.

   

   argv-minus-one committed May 27, 2020
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