OpenStreetMap layer server returns 404 Not Found

[gb96]

Description

The default OpenStreetMap layer is currently broken, creating a problem for all the demo/example apps. Oct 27, 2017 12:01:39 PM gov.nasa.worldwind.util.SessionCacheRetrievalPostProcessor run SEVERE: Retrieval returned no content for https://worldwind20.arc.nasa.gov/mapcache?EXCEPTIONS=application/vnd.ogc.se_xml&REQUEST=GetCapabilities&SERVICE=WMS&VERSION=1.3.0

Steps to Reproduce

1. runDemo gov.nasa.worldwindx.examples.LayerTreeUsage
2. Click within the LayerTreePanel to enable layer "OpenStreetMap"
3. Observe no OSM tiles loaded and exception output on stderr

Expected behavior: OSM tiles load and become visible, no exceptions thrown.

Actual behavior: OSM tiles cannot load

Reproduces how often: 100%

Operating System and Version

Windows 7 Enterprise SP1 x64

Additional Information

Ideally the NASA tileserver could be fixed and that would address this issue. I have a Pull Request for using the OSMMapnickLayer by default as a workaround.