8368570: [CRaC] Improve JdwpTransportTest

[wkia]

JdwpTransportTest sometimes hangs, so it'd be good to dump Java threads, and create a corefile if possible.

Also improved reading from output stream.

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• JDK-8368570: [CRaC] Improve JdwpTransportTest (Task - P4)

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8368570: [CRaC] Improve JdwpTransportTest

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