[Tile-serving] [openstreetmap/mod_tile] merging per-server and per-virtualhost config is buggy (#188)

[Amanda]

This bug can be reproduced with this apache config:

	ModTileRenderdSocketName /run/tirex/modtile.sock
	ModTileTileDir /var/cache/tirex/tiles
	AddTileConfig /tiles/test test

	<VirtualHost *:80>
			DocumentRoot /var/www/html
			LogLevel tile:debug

			ErrorLog ${APACHE_LOG_DIR}/error.log
			CustomLog ${APACHE_LOG_DIR}/access.log combined
			
			#AddTileConfig /tiles/test3 test 
	</VirtualHost>

Running tirex with just a `test` config. 

Get the tile works fine

	sudo systemctl reload apache2 ; sudo rm /var/cache/tirex/tiles/test/0/0/0/0/0/0.meta  ; curl localhost/tiles/test/0/0/0.png

Uncomment the `#AddTileConfig` and it will break and lose the socket name

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