Should not warn about leisure=slipway connected to highways

[naoliv]

As per ​https://lists.openstreetmap.org/pipermail/talk/2016-May/075989.html, it makes sense to not issue a leisure node connected to a highway when a leisure=slipway is connected to highways.

JOSM:

URL:http://josm.openstreetmap.de/svn/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2016-05-23 13:57:26 +0200 (Mon, 23 May 2016)
Build-Date:2016-05-24 01:33:07
Revision:10268
Relative:URL: ^/trunk

Identification: JOSM/1.5 (10268 en) Linux Debian GNU/Linux testing (stretch)
Memory Usage: 247 MB / 10206 MB (100 MB allocated, but free)
Java version: 1.8.0_91-8u91-b14-2-b14, Oracle Corporation, OpenJDK 64-Bit Server VM
VM arguments: [-Dawt.useSystemAAFontSettings=on]
Dataset consistency test: No problems found

Plugins:
- Create_grid_of_ways (32158)
- DxfImport (1006)
- OpeningHoursEditor (32158)
- PicLayer (32158)
- RoadSigns (32177)
- SimplifyArea (32158)
- apache-commons (32158)
- buildings_tools (32158)
- conflation (0.2.0)
- contourmerge (1014)
- download_along (32158)
- editgpx (32158)
- ejml (32158)
- geotools (31895)
- imagery_offset_db (32158)
- importvec (32158)
- indoorhelper (32158)
- jts (31906)
- log4j (32158)
- measurement (32158)
- merge-overlap (32158)
- opendata (32158)
- pbf (32158)
- pdfimport (32158)
- poly (32158)
- reverter (32158)
- scripting (30722)
- todo (29154)
- turnrestrictions (32158)
- undelete (32158)
- utilsplugin2 (32158)

[Klumbumbus]

In 10272/josm:

fix #12865 - don't warn about highway=services|rest_area + addr:postcode; fix #12868 - don't warn about leisure=slipway connected to highways; warn about leisure=yes