Features:
+* add some optional flag to ReadWritePaths= and friends, that has the effect
+ that we create the dir in question when the service is started. Example:
+
+ ReadWritePaths=:/var/lib/foobar
+
* sort generated hwdb files alphabetically when we import them, so that git
diffs remain minimal (in particular: the OUI databases we import are not
sorted, and not stable)
O_NONBLOCK on it. That way people can control if and when to block for
logging.
+* tighten sd_notify() MAINPID= checks a bit: don't accept foreign PIDs (i.e.
+ PIDs not managed by the service manager)
+
* journald: when we recv a log datagram via the native or syslog transports,
search for the PID in the active stream connections, and let's make sure to
always process the datagrams before the streams. Then, cache client metadata