Make CatalogClient only run examples when it's main.
Make CatalogClient only run examples when it's main.

Make get_islands() return islands instead of databases.

bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg,bigdawg-istc/bigdawg