Revert "Move netifaces to extras"

For now revert this, at a later date we can reapply
this but we need to order this a little differently to
make it work out.

This reverts commit 2abbe1c3b1.

Change-Id: I20f3c5804caf1af698aa0f6397a9953eb9aba829

requirements.txt

@@ -14,4 +14,5 @@ oslo.i18n>=1.5.0 # Apache-2.0
 monotonic>=0.3 # Apache-2.0
 pytz>=2013.6
 netaddr!=0.7.16,>=0.7.12
+netifaces>=0.10.4
 debtcollector>=0.3.0 # Apache-2.0

setup.cfg

@@ -22,10 +22,6 @@ classifier =
 packages =
     oslo_utils
 
-[extras]
-netifaces =
-  netifaces>=0.10.4
-
 [pbr]
 warnerrors = true
 

tox.ini

@@ -4,7 +4,6 @@ envlist = py34,py27,pep8,bandit
 
 [testenv]
 deps = -r{toxinidir}/test-requirements.txt
-       .[netifaces]
 commands = python setup.py testr --slowest --testr-args='{posargs}'
 
 [testenv:pep8]