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

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

Change-Id: Iea1747d814a5011c041ac35677680be3079688d0

README.rst

@@ -25,7 +25,7 @@ Quickstart guide: https://docs.openstack.org/sahara/latest/user/quickstart.html
 
 How to participate: https://docs.openstack.org/sahara/latest/contributor/how-to-participate.html
 
-Source: https://git.openstack.org/cgit/openstack/sahara-plugin-vanilla
+Source: https://opendev.org/openstack/sahara-plugin-vanilla
 
 Bugs and feature requests: https://storyboard.openstack.org/#!/project/openstack/sahara-plugin-vanilla
 

tox.ini

@@ -10,7 +10,7 @@ setenv =
     VIRTUAL_ENV={envdir}
     DISCOVER_DIRECTORY=sahara_plugin_vanilla/tests/unit
 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 {posargs}
@@ -27,7 +27,7 @@ commands = oslo_debug_helper -t sahara_plugin_vanilla/tests/unit {posargs}
 [testenv:pep8]
 basepython = python3
 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
   -r{toxinidir}/doc/requirements.txt
@@ -44,7 +44,7 @@ commands = {posargs}
 [testenv:docs]
 basepython = python3
 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}/doc/requirements.txt
 commands =
     rm -rf doc/html doc/build
@@ -55,7 +55,7 @@ whitelist_externals =
 [testenv:releasenotes]
 basepython = python3
 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}/doc/requirements.txt
 commands =
   rm -rf releasenotes/build releasenotes/html