Audit / updated requirements.txt

[ddohler]

The requirements.txt file we use may not cover all the dependencies of the app; @jbranigan's VM was missing simplejson.

However, doing a pip freeze shows a lot of packages that we shouldn't be relying on; the python requirements should be checked and any extraneous packages removed. The remaining packages should be explicitly included into requirements.txt via pip freeze.

Here's the current output of pip freeze, for reference:

Cheetah==2.4.4
Django==1.7
GDAL==1.10.1
GnuPGInterface==0.3.2
Landscape-Client==12.05
M2Crypto==0.21.1
PAM==0.4.2
PyYAML==3.10
Pyste==0.9.10
Twisted==11.1.0
Twisted-Conch==11.1.0
Twisted-Core==11.1.0
Twisted-Lore==11.1.0
Twisted-Mail==11.1.0
Twisted-Names==11.1.0
Twisted-News==11.1.0
Twisted-Runner==11.1.0
Twisted-Web==11.1.0
Twisted-Words==11.1.0
ZooKeeper==0.4
amqp==1.4.6
anyjson==0.3.3
apt-xapian-index==0.44
argparse==1.2.1
astroid==1.3.2
billiard==3.3.0.19
boto==2.2.2
celery==3.1.10
chardet==2.0.1
cloud-init==0.6.3
command-not-found==0.2.44
configobj==4.7.2
## FIXME: could not find svn URL in dependency_links for this package:
distribute==0.6.24dev-r0
django-extensions==1.3.0
django-filter==0.7
djangorestframework==2.3.13
djangorestframework-csv==1.3.3
euca2ools==2.0.0
gevent==1.0.1
greenlet==0.4.5
gunicorn==17.5
httplib2==0.7.2
ipdb==0.8
ipython==1.2.1
juju==0.5
keyring==0.9.2
kombu==3.0.24
language-selector==0.1
launchpadlib==1.9.12
lazr.restfulclient==0.12.0
lazr.uri==1.0.3
logilab-common==0.63.2
lxml==2.3.2
oauth==1.0.1
paramiko==1.7.7.1
psycopg2==2.5.2
pyOpenSSL==0.12
pyasn1==0.0.11a
pycrypto==2.4.1
pycurl==7.19.0
pydot==1.0.2
pylint==1.1.0
pyparsing==1.5.2
pyserial==2.5
python-apt==0.8.3ubuntu7.1
python-dateutil==1.5
python-debian==0.1.21ubuntu1
pytz==2014.10
requests==2.2.1
simplejson==2.3.2
six==1.8.0
transitfeed==1.2.13
txAWS==0.2
txzookeeper==0.9.5
ufw==0.31.1-1
unattended-upgrades==0.1
wadllib==1.3.0
wsgiref==0.1.2
zope.interface==3.6.1

[flibbertigibbet]

I just destroyed my vagrant box and reprovisioned, and all seems well. The only place we seem to be using simplejson is to catch JSONDecodeError in parsing scala responses to the feed parser celery task. I'm guessing the other packages pip freeze output are mostly incidental Ubuntu packages, such as ufw.