Adding python3 dependency in python-contrail rpm build
Adding python3 dependency in python-contrail rpm build

Adding python2-future and python-configparser dependency in
python-contrail rpm build to support python 3 in the
contrail-config-common package.
Also refresh the dependeny list.

Change-Id: Iced4c1180c0e4fcc653fd6c7314de69e6fc4fba6
Partial-Jira-Bug: CEM-7481

Juniper/contrail-packages,Juniper/contrail-packages