modify test-requirement according to requirements project

the OpenStack requirements project has modify version requirement of docutils/oslosphinx.
The link is below
https://review.openstack.org/#/c/418772/
So modify test-requirement like other project
Closes-Bug: #1666149

Change-Id: I145ba596926cac0efab75fb4a1548eea338a2d5a

test-requirements.txt

@@ -5,7 +5,7 @@
 hacking>=0.10.2,<0.11  # Apache-2.0
 
 coverage>=3.6
-docutils>=0.11,!=0.13.1 # OSI-Approved Open Source, Public Domain
+docutils>=0.11 # OSI-Approved Open Source, Public Domain
 extras
 fixtures>=0.3.14
 jsonschema>=2.0.0,<3.0.0,!=2.5.0
@@ -13,8 +13,8 @@ mock>=1.2
 python-glanceclient>=0.18.0
 python-keystoneclient>=1.1.0
 python-subunit>=0.0.18
-sphinx>=1.1.2,!=1.2.0,!=1.3b1,<1.3
-oslosphinx>=2.5.0,<2.6.0  # Apache-2.0
+sphinx>=1.5.1 # BSD
+oslosphinx>=4.7.0  # Apache-2.0
 oslotest>=1.5.1,<1.6.0  # Apache-2.0
 reno>=0.1.1  # Apache2
 testrepository>=0.0.18