Closes #178

Some tests will induce behavior that causes the remote end to close
the connection before all of the data has been written.  With small
kernel buffer sizes, this can cause an EPIPE error.  Since the test
expects an early close, this can be ignored.

The importlib module must use real thread locks, not eventlet.Semaphore.

If it's determined that a MySQL test should be skipped during setUp(),
but after the parent setUp() has been called, having created and
started a timer, then tearDown() is never called and the timer never
cancelled, but left to expire during some future, unrelated test.

Move call to parent setUp() to end of child setUp() to insure that the
timer is only created and started after it's been determined that the
test shouldn't be skipped (ie create_db()).

Some error paths concatenate the output of "type" with a string,
which gives TypeError: cannot concatenate 'str' and 'type' objects,
rather than describing the actual error.

Closes #149 GH
Closes #150 GH

Conflicts:
	eventlet/hubs/twistedr.py

order in the class constructor so it uses the same order as the actual class
from Python 3.3 and above.

TimeoutExpired from Python 3.3 takes arguments in the following order:
cmd, timeout, output.

See https://github.com/python/cpython/blob/master/Lib/subprocess.py#L388

This restores tests removed in 23beb7d43e