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

Change-Id: I80c0661599c18e01b5a51444423513f99084e3e8
Closes-Bug: #1826195

README.rst

@@ -24,6 +24,6 @@ as `root` from OpenStack services.
 
 * License: Apache License, Version 2.0
 * Documentation: https://docs.openstack.org/oslo.rootwrap/latest/
-* Source: https://git.openstack.org/cgit/openstack/oslo.rootwrap
+* Source: https://opendev.org/openstack/oslo.rootwrap
 * Bugs: https://bugs.launchpad.net/oslo.rootwrap
 * Release notes: https://docs.openstack.org/releasenotes/oslo.rootwrap/

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}/test-requirements.txt
   -r{toxinidir}/requirements.txt
 # Functional tests with Eventlet involve monkeypatching, so force them to be