[Spark-2.1] Switch minimal java version for Java 1.8

Description

This allows us to also remove the extraJVMArgs option defined in gradle and accross the code.

It is driven by this H2O's change which removes support for Java 1.7 https://github.com/h2oai/h2o-3/pull/3783

Assignee

Jakub Hava

Reporter

Jakub Hava

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