[Tile-serving] [openstreetmap/osm2pgsql] --expire-tiles: Parameter parsing does not work (#830)

[Matthias Köferlein]

After upgrading from Debian Stretch (0.92) to Buster (0.94) our update script stopped working. I have tried many styles of passing the `--expire-tiles` parameter with no luck.
The code parsing this parameter was changed significantly in 24488bfdaec2c432e33144ecb2688387253db37c, breaking existing functionality. The command `osm2pgsql -d gis -H localhost -U gisuser -S ~/osm2pgsql/default.style -P 5432 -s -C 800 -a diffs.osc.gz -e15 -o expire.list`, suggested by the OSM Wiki, no longer works.    

What I have tried so far:
  - `-e19`
  - `-e0-19`
  - `-e 19`
  - `-e "19"`
  - `--expire-tiles 19`
  - `--expire-tiles 0-19`
  - `--expire-tiles "19"`
  - `--expire-tiles "0-19"`
  - `--expire-tiles "just work pls"`

When supplying only the max zoom level, I get "_ERROR: Minimum and maximum zoom level for tile expiry must be separated by '-'._" Supplying both min and max yields "_ERROR: Missing zoom level for tile expiry._" Negative zoom levels actually get caught and throw an error.

Is this a user error on my side or is this option actually broken?

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https://github.com/openstreetmap/osm2pgsql/issues/830
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