Update Apache Spark to latest stable version
Update Apache Spark to latest stable version

Apache Spark from 2.x series has been updated to 2.2.0 in order to
cash in on all the fixes that were produced since version 2.0.1 that
we installed prior this update.

Since minor versions are API compatible, this should be transparent to
the application writers.

Change-Id: Ia63d7fc3f358f66e7ef1a17750ecc131504c3a35

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