RFR 8016455: Sync stream tests from lambda to tl

[Paul Sandoz]

Hi,

This patch synchronizes the test framework and many of the tests from lambda to tl and improves:

1) the asserting of results, indicating whether the result to assert on has an encounter order and was computed in parallel. This will become more relevant when the improvements to the limit operation are submitted to tl.

2) the setting of a context when a test method performs multiple tests, such that when failure occurs that context is logged and it is easier to determine what failed.

  http://cr.openjdk.java.net/~psandoz/tl/JDK-8016455-stream-tests/webrev/

Paul.