After increasing the default timeout for the barrier, the unittest for the default timeout must be adjusted

test_return_header_keep_alive - Added a cleanup call for the socket.

for append that isn't seekable.  Patch by Brian Brazil.

were given to it.  Patch by Brian Brazil.

Increase the default timout of the barries used in the barrier tests.  This should solve unexpected timeouts on some machines.

Also call super().tearDown() where appropriate.