Add pip and setuptools to requirements files

These packages were getting silently updated, making vendoring these dependencies difficult.

This ensures that the expected versions of these packages are installed in the virtualenvs.

requirements/requirements.in

@@ -49,3 +49,5 @@ slackclient==1.0.2
 twilio==5.6.0
 uWSGI==2.0.14
 xmltodict==0.10.2
+pip==8.1.2
+setuptools==23.0.0

requirements/requirements.txt

@@ -197,4 +197,5 @@ xmltodict==0.10.2
 zope.interface==4.3.3     # via twisted
 
 # The following packages are considered to be unsafe in a requirements file:
-# setuptools                # via cryptography, django-polymorphic, python-ldap, zope.interface
+pip==8.1.2
+setuptools==23.0.0

requirements/requirements_ansible.in

@@ -11,3 +11,5 @@ pyvmomi==6.5
 pywinrm[kerberos]==0.2.2
 secretstorage==2.3.1
 shade==1.13.1
+setuptools==23.0.0
+pip==8.1.2

requirements/requirements_ansible.txt

@@ -128,4 +128,5 @@ wrapt==1.10.8             # via debtcollector, positional
 xmltodict==0.10.2         # via pywinrm
 
 # The following packages are considered to be unsafe in a requirements file:
-# setuptools                # via cryptography
+pip==8.1.2
+setuptools==23.0.0