Bring some uniformity to olso acl files

Currently oslo acl files do different things. When one is looking
at the files for examples of how oslo project permissions work as
a way of evaluating new oslo acl files, there is some confusion.
This patch brings the olso acl files into a common alignment,
providing a template for future oslo acl file structure. It also removes
tagging ACLs from the repositories that don't use tags.

The project-name-core groups have review permission in all branches.
The project-name-ptl groups have tagging permission.

This patch also edits acl files for oslo common libs: pycadf and
taskflow, as well as openstack-dev tools: cookiecutter,
oslo-cookiecutter and pbr. The permission for taskflow-core to
create branches is removed.

This patch removes the need to have the oslo-specs-core and
olso-milestone gerrit groups.

Change-Id: I5cb6948502289d8f4179aabd35885a669df9d174
Merge "Bring some uniformity to olso acl files"