Remove the unused coding style modules

1. Python modules related to coding style checks (listed in blacklist.txt in
openstack/requirements repo) are dropped from lower-constraints.txt
as they are not actually used in tests (other than pep8).

2. remove mock

Change-Id: I8086b6fd925d3b48b53b3165e3802d9d94977b5f

lower-constraints.txt

@@ -54,8 +54,6 @@ linecache2==1.0.0
 logutils==0.3.5
 Mako==1.0.7
 MarkupSafe==1.0
-mccabe==0.2.1
-mock==2.0.0
 monotonic==1.4
 mox3==0.25.0
 msgpack==0.5.6

test-requirements.txt

@@ -2,12 +2,13 @@
 # of appearance. Changing the order has an impact on the overall integration
 # process, which may cause wedges in the gate later.
 
+# Hacking already pins down pep8, pyflakes and flake8
+hacking>=3.0.1,<3.1.0 # Apache-2.0
 
 bandit>=1.1.0 # Apache-2.0
 doc8>=0.6.0 # Apache-2.0
 coverage!=4.4,>=4.0 # Apache-2.0
 fixtures>=3.0.0 # Apache-2.0/BSD
-hacking>=3.0.1,<3.1.0 # Apache-2.0
 oslotest>=3.2.0 # Apache-2.0
 osprofiler>=1.4.0 # Apache-2.0
 os-testr>=1.0.0 # Apache-2.0

zun/container/docker/driver.py

@@ -1062,8 +1062,8 @@ class DockerDriver(driver.BaseDriver, driver.ContainerDriver,
             labels = {}
             slabels = info['Labels']
             if slabels:
-                for l in slabels:
-                    kv = l.split("=")
+                for slabel in slabels:
+                    kv = slabel.split("=")
                     label = {kv[0]: kv[1]}
                     labels.update(label)
             runtimes = []