Now that we have a critical section, races are no longer possible.

rpcrt4: Set the AI_PASSIVE flag to getaddrinfo in rpcrt4_ip_tcp_open so that the bound-to port is connectable from other machines.

the read and write function for the protseq assume that syscalls will block.

to go into an infinite loop if getaddrinfo returned more than one entry.

connection to get at the wait handles, instead of using
get_connect_wait_handle which isn't generic enough to be used for
other protocols.
Remove the unneeded get_connect_wait_handle function from the connection 
operations function list.

rpcrt4: Eliminate the extra thread used for RPC over TCP/IP servers by adding socket-specific server protseq functions.