Align to the other Openstack project and
use testr instead of pytest
Includes:
- pylint and pep8 fixes.
- py34 compliance
- requirements updated
- updated path to dsvm gate job
Change-Id: I10a5ea8d581029eba8f3ab5e016a1dd1919fa117
Depends-On: I4f9050cd551e87d2e398b6f94dc904154d0b1b13