Update some URLs in README and tox

Use opendev.org URLs, point to storyboard instead of launchpad

Change-Id: Ib609aeadfde08cb4c3767d51c3c9ec906504f8a7

README.rst

@@ -8,6 +8,6 @@ This is a fork of the Ryu library tailored for OpenStack Neutron.
 
 * License: Apache License, Version 2.0
 * Documentation: https://docs.openstack.org/os-ken/latest/
-* Source: https://git.openstack.org/cgit/openstack/os-ken
-* Bugs: https://bugs.launchpad.net/os-ken
+* Source: https://opendev.org/openstack/os-ken/
+* Bugs: https://storyboard.openstack.org/#!/project/openstack/os-ken
 * Release Notes: https://docs.openstack.org/releasenotes/os-ken

tox.ini

@@ -14,7 +14,7 @@ setenv =
    OS_STDERR_CAPTURE=1
    OS_TEST_TIMEOUT=60
 deps =
-  -c{env:UPPER_CONSTRAINTS_FILE:https://git.openstack.org/cgit/openstack/requirements/plain/upper-constraints.txt}
+  -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
   -r{toxinidir}/test-requirements.txt
 # TODO(hongbin): this is the way Ryu runs unit tests and we inherit
 # this approach as a start. In the future, we should migrate to stestr