8078334: Mark regression tests using randomness
Reviewed-by: xuelei, alanb

8000330: (fc) FileChannel.truncate issues when given size > file size
8002180: (fc) FileChannel.map does not throw NPE if MapMode specified as null
Reviewed-by: chegar

6962318: Update copyright year
Reviewed-by: xdono

6963027: TEST_BUG: channels and buffer tests need to run in samevm mode
Reviewed-by: ohair, sherman, chegar

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

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