Use safe version of hacking

Versions of hacking from 3.1.0 until 4.0.0, NOT inclusive, are supposed
to require a safe version of flake8, so besides normal issues related
to minor version upgrades, we can safely use those versions.
Also, forcing pycodestyle versions to be compatible with flake8 installed
by hacking.

Also, listing all dependencies in lower-constraints, including
dependencies from other libraries and projects.

Change-Id: I8eca30c2b04c2298e09482b2f04f0b43267f67ca

lower-constraints.txt

@@ -1,14 +1,14 @@
 alabaster==0.7.10
 appdirs==1.3.0
 Babel==2.3.4
+cliff==3.1.0
+cmd2==0.8.9
 coverage==4.0
 docutils==0.11
 dulwich==0.15.0
 extras==1.0.0
 fixtures==3.0.0
-flake8==2.5.5
-flake8-import-order==0.17.1
-hacking==3.0.0
+future==0.18.2
 imagesize==0.7.1
 iso8601==0.1.11
 Jinja2==2.10
@@ -22,8 +22,12 @@ os-client-config==1.28.0
 oslotest==3.2.0
 pbr==2.0.0
 pep8==1.5.7
+prettytable==0.7.2
+pycodestyle==2.5.0
 pyflakes==0.8.1
 Pygments==2.2.0
+pyparsing==2.4.7
+pyperclip==1.8.0
 python-dateutil==2.7.0
 python-mimeparse==1.6.0
 python-subunit==1.0.0
@@ -32,13 +36,17 @@ PyYAML==3.12
 reno==2.5.0
 requests==2.14.2
 requestsexceptions==1.2.0
+six==1.14.0
 snowballstemmer==1.2.1
 Sphinx==1.6.2
 sphinxcontrib-websupport==1.0.1
-stevedore==1.29.0
 stestr==2.0.0
+stevedore==1.29.0
 sushy==2.0.0
+testrepository==0.0.20
 testscenarios==0.4
 testtools==2.2.0
 traceback2==1.4.0
 unittest2==1.1.0
+voluptuous==0.11.7
+wcwidth==0.1.9

test-requirements.txt

@@ -2,7 +2,7 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
-hacking>=3.0.0,<3.1.0 # Apache-2.0
+hacking>=3.1.0,<4.0.0 # Apache-2.0
 
 coverage!=4.4,>=4.0 # Apache-2.0
 python-subunit>=1.0.0 # Apache-2.0/BSD
@@ -13,6 +13,7 @@ stestr>=2.0.0 # Apache-2.0
 testscenarios>=0.4 # Apache-2.0/BSD
 testtools>=2.2.0 # MIT
 flake8-import-order>=0.17.1 # LGPLv3
+pycodestyle>=2.0.0,<2.7.0 # MIT
 
 # releasenotes
 reno>=2.5.0 # Apache-2.0