Replace git.openstack.org URLs with opendev.org URLs

Change-Id: I613b5676676215c6f80d309799a2efd715894ee7

CONTRIBUTING.rst

@@ -14,4 +14,4 @@ Pull requests submitted through GitHub will be ignored.
 
 Bugs should be filed on Launchpad, not GitHub:
 
-   https://bugs.launchpad.net/mox3
+   https://bugs.launchpad.net/python-mox3

README.rst

@@ -1,6 +1,6 @@
-===========================================
- Mox3 - Mock object framework for Python 3
-===========================================
+=========================================
+Mox3 - Mock object framework for Python 3
+=========================================
 
 .. image:: https://governance.openstack.org/tc/badges/mox3.svg
     :target: https://governance.openstack.org/tc/reference/tags/index.html
@@ -60,5 +60,5 @@ OpenStack Fork
 
 * Free software: Apache license
 * Documentation: https://docs.openstack.org/mox3/latest/
-* Source: https://git.openstack.org/cgit/openstack/mox3
+* Source: https://opendev.org/openstack/mox3
 * Bugs: https://bugs.launchpad.net/python-mox3

tox.ini

@@ -5,7 +5,7 @@ envlist = py35,py27,pep8
 [testenv]
 install_command = pip install {opts} {packages}
 deps =
-       -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+       -c{env:UPPER_CONSTRAINTS_FILE:https://opendev.org/openstack/requirements/raw/branch/master/upper-constraints.txt}
        -r{toxinidir}/requirements.txt
        -r{toxinidir}/test-requirements.txt
 commands = stestr run --slowest {posargs}