[SPARK-9206] [SQL] Fix HiveContext classloading for GCS connector. #7549
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IsolatedClientLoader.isSharedClass includes all of com.google., presumably
for Guava, protobuf, and/or other shared Google libraries, but needs to
count com.google.cloud. as "hive classes" when determining which ClassLoader
to use. Otherwise, things like HiveContext.parquetFile will throw a
ClassCastException when fs.defaultFS is set to a Google Cloud Storage (gs://)
path. On StackOverflow: http://stackoverflow.com/questions/31478955
EDIT: Adding @yhuai who worked on the relevant classloading isolation pieces.