Features:
+* check ID_RENAMING= property from PID1's .device logic, and don't consider
+ devices that are being renamed.
+
* make MAINPID= message reception checks even stricter: if service uses User=,
then check sending UID and ignore message if it doesn't match the user or
root.
* paranoia: whenever we process passwords, call mlock() on the memory
first. i.e. look for all places we use string_erase()/string_free_erase() and
- augment them with mlock()
+ augment them with mlock(). Also use MADV_DONTDUMP
* whenever oom_kill memory.event event is triggered print a nice log message