Features:
+* fix logging in execute.c: extend log.c to have an optional mode where
+ log_open() is implicitly done before each log line and log_close() right
+ after. This way we don't have open fds around but logs will still
+ work. Because it is slow this mode should used exclusively in the execute.c
+ case.
+
+* set IPAddressDeny=any on all services that shouldn't do networking (possibly
+ combined with IPAddressAllow=localhost).
+
* dissect: when we discover squashfs, don't claim we had a "writable" partition
in systemd-dissect