Change the doc8 check mode

In Ib226cbf9fc1fb7d3146083d65c44d8e0b80e2a7b we were introduced the doc8
check, but the configuration in cyborg/tox.ini is incorrect. This patch
will combine the doc8 check in [testenv:docs] to fix 'tox -e doc8' error.

Story: 2008084
Task: 40785

Change-Id: I9eb30de1407022a31086caab265e5e51e3d06bf9

requirements.txt

@@ -1,6 +0,0 @@
-# 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.
-
-pbr>=2.0 # Apache-2.0
-doc8>=0.8.0

test-requirements.txt

@@ -8,3 +8,5 @@ coverage>=4.0,!=4.4 # Apache-2.0
 sphinx>=2.0.0,!=2.1.0 # BSD
 stestr>=1.0.0 # Apache-2.0
 openstackdocstheme>=2.2.1 # Apache-2.0
+pbr>=2.0 # Apache-2.0
+doc8>=0.8.0 # Apache-2.0

tox.ini

@@ -13,16 +13,15 @@ setenv =
    OS_STDOUT_CAPTURE=1
    OS_STDERR_CAPTURE=1
    OS_TEST_TIMEOUT=60
-deps = -r{toxinidir}/doc/requirements.txt
+deps = -c{env:UPPER_CONSTRAINTS_FILE:https://releases.openstack.org/constraints/upper/master}
+       -r{toxinidir}/test-requirements.txt
+       -r{toxinidir}/doc/requirements.txt
 commands = stestr run {posargs}
 
 [testenv:pep8]
-deps =
-  -r{toxinidir}/doc/requirements.txt
-  -r{toxinidir}/test-requirements.txt
 commands =
     flake8 {posargs}
-    doc8 specs doc/source
+    doc8 specs/
 
 [testenv:venv]
 commands = {posargs}
@@ -39,6 +38,7 @@ commands =
 
 [testenv:docs]
 commands = sphinx-build -W -b html doc/source doc/build/html
+           doc8 --ignore D001 doc/
 
 [testenv:releasenotes]
 commands =
@@ -54,9 +54,3 @@ show-source = True
 ignore = E123,E125
 builtins = _
 exclude=.venv,.git,.tox,dist,doc,*lib/python*,*egg,build
-
-[testenv:doc8]
-deps =
-    -r{toxinidir}/requirements.txt
-    doc8
-commands = doc8 specs doc/source