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Add support for a core framework JAVA_OPTS property [1] that can be optionally set depending on the runtime environment. For slower or more complex execution environments, that property value can be increased, to make scenarios wait longer before considering their steps as completed. Document that new property, why and how to use it if necessary. [1] https://gerrit-review.googlesource.com/Documentation/dev-e2e-tests.html#_environment_properties Change-Id: Ie477a079f205b712643fce766b7043cbde5f1487