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: Iff24e8d5082d8ef8dc2d29ea92288bf418f5500d
diff --git a/test-requirements.txt b/test-requirements.txt
index af89592..f53437e 100644
--- a/test-requirements.txt
+++ b/test-requirements.txt
@@ -6,7 +6,8 @@
coverage!=4.4,>=4.0 # Apache-2.0
python-subunit>=1.0.0 # Apache-2.0/BSD
-sphinx!=1.6.6,!=1.6.7,>=1.6.2 # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2,<2.0.0;python_version=='2.7' # BSD
+sphinx!=1.6.6,!=1.6.7,>=1.6.2;python_version>='3.4' # BSD
oslotest>=3.2.0 # Apache-2.0
testrepository>=0.0.18 # Apache-2.0/BSD
testtools>=2.2.0 # MIT