Ionit

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* Fix issues found by pylint 2.4.4
(fixes [Debian bug 946034](https://bugs.debian.org/946034))

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* Drop `After=local-fs.target` from `ionit.service` to break dependency loop
(fixes [Debian bug 931060](https://bugs.debian.org/931060))

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* Run `ionit.service` before `systemd-udev-trigger.service`
(fixes [Debian bug 919690](https://bugs.debian.org/919690))

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* Run `ionit.service` before `systemd-modules-load.service`

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* Support specifying a configuration file (instead of a directory)
* Support specifying `--config` multiple times

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* Remove unnecessary pass statement to make pylint 2.2.2 happy
(fixes [Debian bug 918550](https://bugs.debian.org/918550))