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What this PR does
Fixes #536
Currently ArcGIS Mapservers group can only handle nesting groups 1 level deep. This PR adds a recursive check which will allow nesting to be as deep as defined by the Mapservice config.
Test me
http://ci.terria.io/issue-536/#clean&https://gist.githubusercontent.com/sixlighthouses/a4fd27b75f41638efe902fa29ddf2825/raw/9167cbe29e558c4be7a269d37fd8298464278866/test.json
Open Data Catalog and Click through the multi level groups under Planning Overlays -- as per image above
prior to this change no layers are displayed under the second level groups i.e Environment and Landscape
Checklist
doc/
.