pflocal: Handle non-blocking connect with no pending acceptors.

* pflocal/connq.h (struct connq_request): Remove forward.
(connq_listen): Wait for a request to be queued not until there is
a connection attempt.  Remove REQ parameter.  Update callers.
(connq_request_complete): Remove declaration.
(connq_connect): Wait for a slot to queue a request not until
there is an acceptor.  Remove SOCK parameter.  Update callers.
(connq_connect_complete): New declaration.
(connq_connect_cancel): New declaration.
* pflocal/connq.c (struct connq): Remove fields noqueue, queue, length,
head and tail.  Add fields head, tail, count, max, connectors and
num_connectors.  That is, replace the circular buffer with a
singly linked list.
(qnext): Remove function.
(struct connq_request): Remove field signal, lock, completed and
err.  Add field next.
(connq_request_init): Rewrite according to new semantics.
(connq_request_enqueue): New function.
(connq_request_dequeue): New function.
(connq_create): Update according to new semantics.
(connq_destroy): Likewise.
(connq_listen): Rewrite to not block until there is a connector
but until there is a request in the queue.
(connq_request_complete): Remove function.
(connq_connect): Rewrite to not block until there is an acceptor
but until there is space for a request.
(connq_connect_complete): New function.
(connq_connect_cancel): New function.
(connq_compress): Remove dead code.
(connq_set_length): Rewrite.
* pflocal/socket.c (S_socket_connect): Create the server socket here...
(S_socket_accept): ... not here.

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