factor out common server implementation code

Most of the server implementation of V1 API now resides in
api.v1.server_glue. The webframeworks only supply some glue code
which is independent to changes in the API code.

nominatim/api/v1/__init__.py

@@ -8,6 +8,12 @@
 Implementation of API version v1 (aka the legacy version).
 """
 
+#pylint: disable=useless-import-alias
+
+from nominatim.api.v1.server_glue import (ASGIAdaptor as ASGIAdaptor,
+                                          EndpointFunc as EndpointFunc,
+                                          ROUTES as ROUTES)
+
 import nominatim.api.v1.format as _format
 
 list_formats = _format.dispatch.list_formats