Sync Sphinx requirement

1. Sync sphinx dependency with global requirements. It caps python 2 since
sphinx 2.0 no longer supports Python 2.7.
2. Update some URLs to latest
3. Remove unncessary "=="

Change-Id: I5fe3be557f9bc3cc1f8faae198df93ed4ed2bc97

README.rst

@@ -11,9 +11,9 @@ Team and repository tags
 os-apply-config
 ===============
 
------------------------------------------------
+----------------------------------------------
 Apply configuration from cloud metadata (JSON)
------------------------------------------------
+----------------------------------------------
 
 What does it do?
 ================
@@ -79,7 +79,7 @@ example::
        +-- mysql
              +-- mysql.conf
 
-An example tree can be found `here <http://git.openstack.org/cgit/openstack/tripleo-image-elements/tree/elements/keystone/os-apply-config>`_.
+An example tree can be found `here <https://opendev.org/openstack/tripleo-image-elements/src/branch/master/elements/os-apply-config>`_.
 
 If a template is executable it will be treated as an *executable
 template*.  Otherwise, it will be treated as a *mustache template*.

setup.cfg

@@ -5,7 +5,7 @@ author-email = openstack-discuss@lists.openstack.org
 summary = Config files from cloud metadata
 description-file =
 	README.rst
-home-page = http://opendev.org/openstack/os-apply-config
+home-page = https://opendev.org/openstack/os-apply-config
 classifier =
 	Development Status :: 4 - Beta
 	Environment :: Console

test-requirements.txt

@@ -7,7 +7,8 @@ coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
 mock>=2.0.0 # BSD
 python-subunit>=1.0.0 # Apache-2.0/BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.5 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.5,<2.0.0;python_version=='2.7'  # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.5;python_version>='3.4'  # BSD
 stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT