Most of OpenStack projects have specs.
Specs are documents in .rst format with fixed structure.
They allow developers to use standard gerrit code review approach
to discuss and align future changes in project.
This patch includes:
- doc/specs directory
- doc/specs readme files
- spec template.rst
- unit tests that checks that specs are regarding template
Change-Id: I31e0dbb8bcbc68ca40c67c643d44b27359906b9c