8163305: Add some print instrumentation to java/nio/channels/Selector/RacyDeregister
Summary: Perform more iterations on Windows, and on all platforms if the test enters the failure branch, poll for an extra period of time to determine whether it might have succeeded with a longer timeout
Reviewed-by: chegar
8163431: probeContentType/Basic.java fails after changes for JDK-8146215
Summary: Allow multiple legal MIME type interpretations for certain extensions.
Reviewed-by: chegar