cgroups-agent: down-grade log level
core: dispatch run queue only if there's nothing else to do

Always read all external events before we decide what we do next.
device: modernizations
swap: split state machine state ACTIVATING into two

We expect the event on /proc/swaps before we expect the SIGCHILD,
reflect this in the state machine.
core: set some event source priorities to enforce dispatching order
core: fix serialization of exec command structs
core: fix bus serialization of conditions
systemctl: when status is called without arguments show pager
systemctl: remove debug log message
udev-builtin-keyboard: More useful error message

Make the "Error calling EVIOCSKEYCODE" error message more useful by mentioning
which scan/key code it tried to set.