Delete Support_PortManager & OldDatagramSocketTest

Support_PortManager didn't really work, so rewrite all tests
that use it.

Also, dedup OldDatagramSocketTest with the harmony DatagramSocketTest.

Fix various broken test cases and terribly written tests.

bug: 11689863

Change-Id: I4efb9e02eb88517273fff50a0dec1d0262feafb2
12 files changed