Fixed bug #895: Metaproxy fails some 2 tests on flurry. The reason

Fixed bug #895: Metaproxy fails some 2 tests on flurry. The reason
for tests failing was due to a an exisiting service on port 9123 which
is used temporarily for making a "pipe" for ThreadPoolSocketObserver
class implementation. The code now uses a regular pipe on Unix and
only a real socket on Windows. However, the code is updated to use
write/read on Unix in this case, since send/recv does not work on pipes.
OTOH, on Windows only send/recv are supported on sockets.