remove liberty workaround for sahara-dashboard
remove liberty workaround for sahara-dashboard

integration tests for sahara-dashboard doesn't have
liberty branch.

Change-Id: I526d7f828fe103c092f4def4c4cc5bf201a2f9f8

openstack-infra/project-config,openstack-infra/project-config,Tesora/tesora-project-config,Tesora/tesora-project-config