Revert "ROOT_PATH should not be appended to "sys.path""
Revert "ROOT_PATH should not be appended to "sys.path""

This reverts commit e681bc2e2f1e5dc7ffd4f03d88d6691d962be6f7.

Change-Id: Ib291c1dc04c92173a7a165a8fb0eec2b2165884b
Closes-Bug: #1791451

openstack/horizon,noironetworks/horizon,NeCTAR-RC/horizon,ChameleonCloud/horizon,ChameleonCloud/horizon,noironetworks/horizon,ChameleonCloud/horizon,noironetworks/horizon,NeCTAR-RC/horizon,NeCTAR-RC/horizon,NeCTAR-RC/horizon,noironetworks/horizon,openstack/horizon,ChameleonCloud/horizon,openstack/horizon,openstack/horizon