[Bug 1210253] Fix proposed to horizon (stable/havana)

[OpenStack Infra]

Fix proposed to branch: stable/havana
Review: https://review.openstack.org/67401

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https://bugs.launchpad.net/bugs/1210253

Title:
  With Havana 2 installed, Launching horizon UI results in the error "
  NameError: name 'Dashboard' is not defined"

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