Re-add the ability to create drop-ins for daemons

[mitchellrj]

For example, prior to 3.0.0, one could achieve a journald drop-in with:

        systemd_journald "my-overrides" do
          drop_in true
          max_retention_sec 3600
          notifies :restart, "service[systemd-journald]", :delayed
        end

but this doesn't appear to be possible any more with the new drop-in structure?

[nathwill]

hi @mitchellrj, thanks for the inquiry. in v3.0 we got rid of the direct configuration editing for daemon configuration files, so the systemd_journald resource automatically creates drop-ins now

i.e. this resource will create this configuration.

hope that helps!