Handle timeout exception in roundup-server better. A timeout in roundup-server used to generate another exception: OSError: cannot read from timed out object when it tried to reuse the socket that timed out. Now return status 408, a brief message and trigger closing of the socket. Manual testing, no CI. To test used curl -X POST with no --data defined.

#!/usr/bin/env python
from __future__ import print_function
import zlib, base64, sys
print(base64.encodestring(zlib.compress(sys.stdin.read())))