According to Openstack summit session [1],
stestr is maintained project to which all Openstack projects should migrate.
So we should switch to stestr.
[1] https://etherpad.openstack.org/p/YVR-python-pti
Change-Id: I753abb6ceae046e388357450a6cdb84af6e5fe74
Add structure, unit tests, and template for mistral-specs, creating
a functional specs repository without any approved specs.
Put example.rst in mitaka/approved and mitaka/implemented respectively
to avoid doc build warnings:
"pattern u'specs/mitaka/approved/*' didn't match any documents"
Implements: blueprint mistral-spec-repository
Change-Id: I092ec2f9b1aef9b1bf328658674119eb3cdf3380