[systemd-devel] [PATCH] core: Filter by state behind the D-Bus API, not in the systemctl client.

[David Timothy Strauss]

This is a completed version of the patch Lennart and I worked on at
the hackfest. The version we worked on had separate string arguments
for each type of state. This patch harmonizes it more with the way
systemctl --state already works, which is an array of possible states
to match across all state types. ListUnits is retained for API
compatibility, but systemctl is updated to always use
ListUnitsFiltered, even with an empty array.