Merge pull request #3190 from poettering/logind-fixes

diff --cc TODO
index 74151f0f86f498a3afcbd6136273c2202505be95,b44670ad9d415783cf88e8d4aab6da19ae0177ee..2a8af13a14e36b9e5256f1aa1f64dd468a93fa23
--- 1/TODO
--- 2/TODO
+++ b/TODO
@@@ -33,8 -33,10 +33,12 @@@ Janitorial Clean-ups
  
  Features:
  
 +* make sure the ratelimit object can deal with USEC_INFINITY as way to turn off things
 +
+ * maybe: pid1: replace cgroups agent transport by AF_UNIX/SOCK_DGRAM, so that
+   we aren't hit by socket backlog exhaustion on the dbus AF_UNIX/SOCK_STREAM
+   socket
+ 
  * journalctl: make sure -f ends when the container indicated by -M terminates
  
  * rework fopen_temporary() to make use of open_tmpfile_linkable() (problem: the