Change how the configuration files path are passed to OCitySMap
Change how the configuration files path are passed to OCitySMap

Instead of having to pass a list, we can now also pass just a single
string or None, in which case a default set of config file paths will
be tried.

Signed-off-by: Thomas Petazzoni <a5d87d2bd7c424ee5cbdb4e978635bf653d5a005@enix.org>
Signed-off-by: Maxime Petazzoni <76f7aeeb2d6ed04ef2b101cc81e4baac9b89c3cf@bulix.org>

maposmatic/ocitysmap,dittaeva/ocitysmap,dittaeva/ocitysmap,ccnz/eqnz-ocitysmap,maposmatic/ocitysmap,maposmatic/ocitysmap