Jarv/santize split

creating separate options to clean the prod_grader and wwc dbs

Needed for edge which doesn't have a prod_grader db

optionally override cms hostname in nginx

adding an option to override the default cache path for ec2.py

Han/fix motd

Correcting /usr/share/landscape file

adding stage config

moving boto back to 2.20.1

adding an sql script for sanitizing the prod mysql db

Modify jenkins worker task to run the wheel script 

edx-west: use local temp dir for sockets and ansible cache

I was having problems where concurrent installs could trample on each
other.  The instance that immediately affected me was output caching
from ec2.py: the output of that command is different between staging and
prod, and both were being written to /tmp/ansible_ec2.cache and .index.

Fix here is to write to a local temp directory.  This creates empty temp
dirs to ensure that they are created in all repos.

While less likely, you could have collisions on named ssh sockets.
Those are named with just the instance name, which could be re-used
across VPC's.  Putting those in the ./tmp dir too prevents that.

Note that for consistency I did away with just the plain ec2.ini file,
and instead now there are prod- and stage- variants.  This is clean but
now means that you'll need to change your install command to look
something like this:

    ANSIBLE_EC2_INI=prod-ec2.ini ANSIBLE_CONFIG=prod-ansible.cfg ansible-playbook -c ssh -u ubuntu -i ./ec2.py prod-app.yml

Conflicts:

	playbooks/edx-west/ansible.cfg

removing json_lint.sh script

Adding new GA var.