MEDIUM: connections: Remove CONN_FL_SOCK*

Now that the various handshakes come with their own XPRT, there's no
need for the CONN_FL_SOCK* flags, and the conn_sock_want|stop functions,
so garbage-collect them.
diff --git a/src/proto_uxst.c b/src/proto_uxst.c
index 42e0dc8..66093af 100644
--- a/src/proto_uxst.c
+++ b/src/proto_uxst.c
@@ -578,20 +578,7 @@
 		return SF_ERR_RESOURCE;
 	}
 
-	if (conn->flags & (CO_FL_HANDSHAKE | CO_FL_WAIT_L4_CONN)) {
-		conn_sock_want_send(conn);  /* for connect status, proxy protocol or SSL */
-	}
-	else {
-		/* If there's no more handshake, we need to notify the data
-		 * layer when the connection is already OK otherwise we'll have
-		 * no other opportunity to do it later (eg: health checks).
-		 */
-		flags |= CONNECT_HAS_DATA;
-	}
-
-	if (flags & CONNECT_HAS_DATA)
-		conn_xprt_want_send(conn);  /* prepare to send data if any */
-
+	conn_xprt_want_send(conn);  /* for connect status, proxy protocol or SSL */
 	return SF_ERR_NONE;  /* connection is OK */
 }