Fixing up error logging

Fixing issue where plaintext passwords could be written to logs
Fixing up todo issues where error events needed to be passed back from the
service layer when the hosting component fails.

src/Microsoft.SqlTools.ServiceLayer/Hosting/Protocol/MessageDispatcher.cs

@@ -243,6 +243,11 @@ namespace Microsoft.SqlTools.ServiceLayer.Hosting.Protocol
                 // previous message.  In this case, do not try to dispatch it.
                 if (newMessage != null)
                 {
+                    // Verbose logging
+                    string logMessage = String.Format("Received message of type[{0}] and method[{1}]",
+                        newMessage.MessageType, newMessage.Method);
+                    Logger.Write(LogLevel.Verbose, logMessage);
+
                     // Process the message
                     await this.DispatchMessage(newMessage, this.MessageWriter);
                 }