Do not add current tenant to private flavor access

Avoid adding the current tenant to the flavor access list when
a private flavor is created. In ordeir to add tenants to the
flavor access list we should use the add_tenant api.

Tempest has to be updated accordingly:
https://review.openstack.org/81551

Documentation has to be updated as well:
https://review.openstack.org/82175

Partially (just for the V2 API rather than V2 and V3)
reverts commit 6ba248635b70860a44e486e7739efa4cc6612ce6

Fixes unittest which was added in the original commit so it checks
for the behaviour we have now rather than the behaviour after the
backwards incompatible change which is being reverted.

Change-Id: I731081b6df0d96df1bc1763d214d28c62bbbb51c
Closes-Bug: #1286297
Imported Translations from Transifex

Change-Id: I8ae613b1f3d4166e329f7b844965e507b9121596
Tell pip to install packages it sees globally

Use pip's option to force installation of packages so that
local copies are installed in the virtualenv, even if they
are present in the global site-packages directory. This
ensures that the latest packages are installed, and that
all of the oslo libraries from namespace packages are
installed in a consistent way, making it possible to run
unit tests on a system where devstack was run previously.

Change-Id: If5c4e12956f2c7be6530c5c9a57fdfb1da8e710c
fix the extension of README in etc/nova

the file is a text file, not a conf file, this change prevents
accidental parsing (and erroring) when setting config_dir=etc/nova

Change-Id: I35c35e812736908858aad235fb173beaf74f74bb
Merge "Tell pip to install packages it sees globally"
Merge "Imported Translations from Transifex"
Merge "fix the extension of README in etc/nova"
Merge "Do not add current tenant to private flavor access"