bpo-30383: Add NEWS entry for backported regrtest (#2438)

diff --git a/Misc/NEWS.d/next/Tests/2017-06-27-13-52-43.bpo-30383.rCmrv7.rst b/Misc/NEWS.d/next/Tests/2017-06-27-13-52-43.bpo-30383.rCmrv7.rst
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+regrtest: Enhance regrtest and backport features from the master branch.
+
+Add options: --coverage, --testdir, --list-tests (list test files, don't run
+them), --list-cases (list test identifiers, don't run them, :issue:`30523`),
+--matchfile (load a list of test filters from a text file, :issue:`30540`),
+--slowest (alias to --slow).
+
+Enhance output: add timestamp, test result, currently running tests, "Tests
+result: xxx" summary with total duration, etc.
+
+Fix reference leak hunting in regrtest, --huntrleaks: regrtest now warms up
+caches, create explicitly all internal singletons which are created on
+demand to prevent false positives when checking for reference leaks.
+(:issue:`30675`).