Remove imported but unused modules

This allows us to enable F401 checks to ensure we're not regressing
on this again.

Change-Id: Ifd94bbaea72afe53daf9291554b68847e7bd34cf

monitoring/alarmdefs/tables.py

@@ -13,7 +13,6 @@
 #    under the License.
 
 from django.core import urlresolvers
-from django.http import HttpResponse
 from django.utils.translation import ugettext_lazy as _  # noqa
 
 from horizon import tables

monitoring/alarms/tables.py

@@ -15,7 +15,6 @@
 
 import json
 
-from django.conf import settings
 from django.core import urlresolvers
 from django.core.urlresolvers import reverse_lazy
 from django import template

monitoring/test/settings.py

@@ -17,7 +17,6 @@ from django.conf import global_settings
 from django.utils.translation import ugettext_lazy as _  # noqa
 
 from horizon.test.settings import *  # noqa
-from horizon.utils import secret_key as secret_key_utils
 
 from openstack_dashboard.test.settings import *  # noqa
 

tox.ini

@@ -29,7 +29,6 @@ exclude = .venv,.git,.tox,dist,*lib/python*,*egg,build,panel_template,dash_templ
 # E127 continuation line over-indented for visual indent
 # E128 continuation line under-indented for visual indent
 # E501 line too long
-# F401 imported but unused
 # F841 local variable is assigned to but never used
 # H102 Apache 2.0 license header not found
 # H238  old style class declaration, use new style
@@ -40,4 +39,4 @@ exclude = .venv,.git,.tox,dist,*lib/python*,*egg,build,panel_template,dash_templ
 # H405  multi line docstring summary not separated with an empty line
 # H803 git commit title should not end with period (disabled on purpose, see bug #1236621)
 # H904  Wrap long lines in parentheses instead of a backslash
-ignore = E127,E128,E501,F401,F841,H102,H238,H301,H305,H306,H307,H405,H803,H904
+ignore = E127,E128,E501,F841,H102,H238,H301,H305,H306,H307,H405,H803,H904