Adding new fab tasks and update existing setup_rhosp_node task
Adding new fab tasks and update existing setup_rhosp_node task

1. Added update_rhosp_node task to upgrade packages in redhat node to latest present in the repos
2. Removed install_rhosp5_repo from setup_rhosp_node because there is going to be multiple repos
3. Replaced run commands with sudo commands

Change-Id: Ib57eb9864014d596de237ebb9bcf391e9f05a6a1

Juniper/contrail-fabric-utils,Juniper/contrail-fabric-utils