Exclude construction connections from dead end check

[Famlam]

Item 1210 class 1 https://github.com/osm-fr/osmose-backend/blob/master/analysers/analyser_osmosis_highway_deadend.py

In a construction area, it is not uncommon for (cycle)ways to be partially constructed and partially under construction. I would propose to exclude highways that are connected to a highway=construction from the analyser_osmosis_highway_deadend check.

Examples: http://osmose.openstreetmap.fr/nl/issue/d18800c8-4483-cbd2-66d7-f1a6832815bc http://osmose.openstreetmap.fr/nl/issue/4b181ffd-426d-b20e-e1ee-0198ca5dc511