[Tile-serving] [openstreetmap/mod_tile] Disallow map section URIs which are starting substrings of subsequent map section URIs (PR #486)

[Hummeltech]

This has unexpected effects for `map` section `URI` values which are starting substrings of subsequent `map` section URIs.

E.g. for:
```ini
[map0]
uri=/map1

[map1]
uri=/map1/1

[map2]
uri=/map2/2
```
Only `map0` and `map2` would be served as `map1` starts with the `uri` for `map0`.

Also, for:

```ini
[map0]
uri=/ # or no uri specification at all

[map1]
uri=/map1/1

[map2]
uri=/map2/2
```
Only `map0`  would be served as both `map1` and `map2` start with the `uri` for `map0`.

This pull request stops these from being allowed in `renderd.conf` files.

Resolves #27 
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/mod_tile/pull/486

-- Commit Summary --

  * Disallow map section URIs which are substrings of subsequent map section URIs

-- File Changes --

    M etc/apache2/renderd-example-map.conf (2)
    M src/renderd_config.c (15)
    M tests/renderd_config_test.cpp (27)

-- Patch Links --

https://github.com/openstreetmap/mod_tile/pull/486.patch
https://github.com/openstreetmap/mod_tile/pull/486.diff

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