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

1. Replace git.openstack.org URLs with opendev.org URLs
2. Remove unncessary "=="
3. Update some URLs to latest

Change-Id: Ie92843a4c2367060f6d4aae7a5766465c7766096

CONTRIBUTING.rst

@@ -1,11 +1,11 @@
 If you would like to contribute to the development of OpenStack,
 you must follow the steps in this page:
-http://docs.openstack.org/infra/manual/developers.html
+https://docs.openstack.org/infra/manual/developers.html
 
 Once those steps have been completed, changes to OpenStack
 should be submitted for review via the Gerrit tool, following
 the workflow documented at:
-http://docs.openstack.org/infra/manual/developers.html#development-workflow
+https://docs.openstack.org/infra/manual/developers.html#development-workflow
 
 Pull requests submitted through GitHub will be ignored.
 

HACKING.rst

@@ -1,4 +1,4 @@
 debtcollector Style Commandments
-===============================================
+================================
 
-Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest
+Read the OpenStack Style Commandments https://docs.openstack.org/hacking/latest

README.rst

@@ -26,6 +26,6 @@ applications) about future deprecations.
 
 * Free software: Apache license
 * Documentation: https://docs.openstack.org/debtcollector/latest
-* Source: https://git.openstack.org/cgit/openstack/debtcollector
+* Source: https://opendev.org/openstack/debtcollector
 * Bugs: https://bugs.launchpad.net/debtcollector
 * Release Notes: https://docs.openstack.org/releasenotes/debtcollector

tox.ini

@@ -9,7 +9,7 @@ setenv =
     CLIENT_NAME=debtcollector
 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://releases.openstack.org/constraints/upper/master}
  -r{toxinidir}/test-requirements.txt
  -r{toxinidir}/requirements.txt
 commands = stestr run --slowest {posargs}