socket: remove deprecated functions: socket_bind_and_listen, set_reuse_addr, connect_tcp and tcp_server

socket: fix bug in dup() - it did not inherit 'timeout' of the original socket; bug introduced in 0.12.0

http: do not silent HttpRequestDeleted in reply_error(), instead don't call it at all if the request was deleted

- rename first_delay to min_delay; set it to 0.01
- add max_delay which limits the maximum sleep time; set it to 1

--HG--
rename : greentest/test_server.py => greentest/test__server.py