Add enum34 requirement

The Zaqar project need enum34 package.

Closes-Bug: #1380859
Change-Id: I1cd4712b8fc5853b24000ecf2b8eb460a24a7b52
Bump oslotest minimum requirements to 1.2.0

Since it was recently released, lets bump minimum version of
oslotest to 1.2.0. Some keystone related projects plan on
leveraging code that is 1.2.0 specific.

Ref: https://review.openstack.org/#/c/130045/

Change-Id: I151d02fe0fa4ef7355847c779b3cbecc87e0c242
Merge "Bump oslotest minimum requirements to 1.2.0"
Merge "Add enum34 requirement"