Remove old excludes

These are detected as errors since the clean up was done[1] in
the requirements repository.

[1] 314734e938f107cbd5ebcc7af4d9167c11347406

Change-Id: Id8de89ba05b21ea944faa001f585b0fd227833d9

doc/requirements.txt

@@ -1,8 +1,5 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
 openstackdocstheme>=2.2.1 # Apache-2.0
-sphinx>=2.0.0,!=2.1.0 # BSD
+sphinx>=2.0.0 # BSD
 sphinxcontrib-apidoc>=0.2.1 # BSD
 
 # releasenotes

requirements.txt

@@ -2,12 +2,8 @@
 # date but we do not test them so no guarantee of having them all correct. If
 # you find any incorrect lower bounds, let us know or propose a fix.
 
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
-
 horizon>=17.1.0 # Apache-2.0
-Babel!=2.4.0,>=2.3.4 # BSD
+Babel>=2.3.4 # BSD
 openstacksdk>=0.53.0 # Apache-2.0
-pbr!=2.1.0,>=2.0.0 # Apache-2.0
+pbr>=2.0.0 # Apache-2.0
 python-keystoneclient>=3.22.0 # Apache-2.0

test-requirements.txt

@@ -1,9 +1,5 @@
-# The order of packages is significant, because pip processes them in the order
-# of appearance. Changing the order has an impact on the overall integration
-# process, which may cause wedges in the gate later.
-
 hacking>=3.0.1,<3.1.0 # Apache-2.0
-coverage!=4.4,>=4.0 # Apache-2.0
+coverage>=4.0 # Apache-2.0
 selenium>=2.50.1 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 stestr>=2.0.0 # Apache-2.0