Improving ip_loadbalancer module

[lcfpadilha]

This pull request is intended to improve the IP Load Balancer module. The added features were:

• Weighted round-robin algorithm for load balancing;
• Weighted least-bandwidth algorithm for load balancing;
• Allow the user to select the load balancing algorithm and server weights using command-line flags;
• Allow the user to change the load balancing algorithm and server weights at runtime using Python interpreter.

These enhancements are part of my final Undergraduate Dissertation (which you can check here) about analyzing the use of SDN for load balancing. We use the IP Load Balancer module to test the response time with different numbers of servers in a server farm and compare the use of SDN.

[raghdaaljaff]

@ lcfpadilha thanks for efforts,where the place of your work brother.