Fix outdated references to git.openstack.org/cgit/

This is a follow-on from the previous OpenDev migration patch,
which catches a few remaining references to cgit, and changes
them to point to the new opendev.org gitea instance.

Change-Id: I64d2d840073e6fa0e6af08ca950b32c8fe248e37

README.rst

@@ -43,4 +43,4 @@ Then:
 .. _stestr: https://stestr.readthedocs.io/
 .. _Tox: https://tox.readthedocs.io/en/latest/
 .. _Sphinx: http://www.sphinx-doc.org/en/master/
-.. _hacking: https://git.openstack.org/cgit/openstack-dev/hacking/plain/HACKING.rst
+.. _hacking: https://opendev.org/openstack/hacking/

{{cookiecutter.repo_name}}/README.rst

@@ -10,7 +10,7 @@ Note that this is a hard requirement.
 
 * Free software: Apache license
 * Documentation: https://docs.openstack.org/{{ cookiecutter.repo_name }}/latest
-* Source: https://git.openstack.org/cgit/{{cookiecutter.repo_group}}/{{ cookiecutter.repo_name }}
+* Source: https://opendev.org/{{cookiecutter.repo_group}}/{{ cookiecutter.repo_name }}
 {%- if cookiecutter.bug_tracker == 'Launchpad' -%}
 * Bugs: https://bugs.launchpad.net/{{ cookiecutter.bug_project }}
 {%- elif cookiecutter.bug_tracker == 'Storyboard' -%}

{{cookiecutter.repo_name}}/tox.ini

@@ -5,14 +5,15 @@ skipsdist = True
 
 [testenv]
 usedevelop = True
-install_command = pip install -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt} {opts} {packages}
+install_command = pip install {opts} {packages}
 setenv =
    VIRTUAL_ENV={envdir}
    PYTHONWARNINGS=default::DeprecationWarning
    OS_STDOUT_CAPTURE=1
    OS_STDERR_CAPTURE=1
    OS_TEST_TIMEOUT=60
-deps = -r{toxinidir}/test-requirements.txt
+deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -r{toxinidir}/test-requirements.txt
 commands = stestr run {posargs}
 
 [testenv:pep8]