Added repos for new fabric and ubuntu-cloud-archive in sources.list of lb

Fabric version in ubuntu repos are older version which lacks some required features.
So added chris-lea ppa for newer version of fabric and added ubuntu-cloud-archive for
python-paramiko version which is required for new fabric.
Fixed the order of networks connected to compute nodes

All nodes must have stgaccess_network connected to its first nic.
For compute nodes eth0 was connected to sdn network, so changed it.
Merge pull request #7 from hkumarmk/stop_using_userdata

Added repos for new fabric and ubuntu-cloud-archive in sources.list of lb, fixed the order of networks connected to compute ndoes