Refactor maintenance options

[Jorres]

1. no longer use options from restart subtree: it made absolutely zero sense that ydbops maintenance --help suddenly had something like --ssh-args or --systemd-unit. Massive refactor of options under the hood, created a new option type for intersecting options between maintenance and restart commands.

2. fixed a series of bugs which prevented ydbops maintenance create --hosts=<id1>,<id2> from working (specifying an FQDN worked)

3. filters such as started or version now work on ydbops maintenance create as well, if you need to create an extra large \ complicated task for some reason (e.g. ydbops maintenance create --hosts=1-1000 --version=...)

4. stop logging a DRAINING warning on Warn level and only log it on Info level (with --verbose enabled)