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

Thorough replacement of git.openstack.org URLs with their opendev.org counterparts.

Change-Id: I2a3b0d80fac1af5862f61b79e4fc31eb6195dcd0

README.rst

@@ -10,5 +10,5 @@ jobs.
 
 * Free software: Apache license
 * Documentation: https://docs.openstack.org/whereto/latest/
-* Source: http://git.openstack.org/cgit/openstack/whereto
+* Source: http://opendev.org/openstack/whereto
 * Bugs: https://storyboard.openstack.org/#!/project/1037

doc/source/index.rst

@@ -11,7 +11,7 @@ whereto is an app for testing redirect rules like what may appear in a
 .htaccess file for Apache. It provides a way to test those rules in CI
 jobs.
 
-:Source: http://git.openstack.org/cgit/openstack/whereto
+:Source: http://opendev.org/openstack/whereto
 :Bugs: https://storyboard.openstack.org/#!/project/1037
 
 .. toctree::

tox.ini

@@ -10,7 +10,7 @@ setenv =
     VIRTUAL_ENV={envdir}
     PYTHONWARNINGS=default::DeprecationWarning
 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
 commands =