Changed default user agent string to include FE version

Author: machavan

src/main/java/com/microsoft/sqlserver/jdbc/SQLServerConnection.java

@@ -314,6 +314,7 @@ public String toString() {
     private static final Lock sLock = new ReentrantLock();
 
     static final String USER_AGENT_TEMPLATE = "%s|%s|%s|%s|%s|%s|%s";
+    static final String USER_AGENT_EXT_VERSION_AND_DRIVER_NAME = "1|MS-JDBC";
     static final String userAgentStr;
 
     static {
@@ -333,7 +334,7 @@ static String getUserAgent() {
                     getRuntimeDetails()
                     );
         } catch(Exception e) {
-            return "MS-JDBC";
+            return USER_AGENT_EXT_VERSION_AND_DRIVER_NAME;
         }
     }