8157499: Mark several tests from jdk_net as intermittently failing
Reviewed-by: chegar

8025211: Intermittent test failure: java/net/DatagramSocket/PortUnreachable.java
Summary: modified test to execute in a single thread to eliminate potential race condition
Reviewed-by: alanb, chegar, dfuchs

6943119: Rebrand source copyright notices
Reviewed-by: darcy, weijun

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