IPOP Service authentication improvements

by srinath for IP-over-P2P Project

IPOP as the name stands is Internet Protocol Over Peer-to-peer. It has wide range of applications like clustering in a cloud environment across different service providers, personal vpn etc. The current implementation requires configuration including credentials in plain text. So it is important from a security standpoint to provide a mechanism in the controller component for a secure way of authentication with XMPP server during bootstrapping process.