Move socket write event handling in to the RFB core

What to do when a socket is writeable should be handled in the
RFB core code as there may be other events we want to fire off
when this happens.
diff --git a/common/rfb/VNCServerST.cxx b/common/rfb/VNCServerST.cxx
index 199524e..d501085 100644
--- a/common/rfb/VNCServerST.cxx
+++ b/common/rfb/VNCServerST.cxx
@@ -163,7 +163,7 @@
   closingSockets.remove(sock);
 }
 
-void VNCServerST::processSocketEvent(network::Socket* sock)
+void VNCServerST::processSocketReadEvent(network::Socket* sock)
 {
   // - Find the appropriate VNCSConnectionST and process the event
   std::list<VNCSConnectionST*>::iterator ci;
@@ -176,6 +176,19 @@
   throw rdr::Exception("invalid Socket in VNCServerST");
 }
 
+void VNCServerST::processSocketWriteEvent(network::Socket* sock)
+{
+  // - Find the appropriate VNCSConnectionST and process the event
+  std::list<VNCSConnectionST*>::iterator ci;
+  for (ci = clients.begin(); ci != clients.end(); ci++) {
+    if ((*ci)->getSock() == sock) {
+      (*ci)->flushSocket();
+      return;
+    }
+  }
+  throw rdr::Exception("invalid Socket in VNCServerST");
+}
+
 int VNCServerST::checkTimeouts()
 {
   int timeout = 0;