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.

A script to clone a database into a vpc using stack-name

There is some work outstanding before this is ready but I believe
it's complete enough to merge.  There will be more logic added
to sanitize and change the db password after the clone is complete

Archive the current virtualenv state as a starting point for new builds

checking change set length doesn't work

adding play mappings for the commoncluster

Allows override of nginx configuration templates via simple variable

update devstack port forwarding for comments service and elasticsearch

`hostname` -> {{ansible_hostname}}

Update main.yml

E0d/preview

Kibana and logstash roles

Updating DNS script for multiple accounts in the edx.org zone

This PR makes the following changes:

* Defaults to the edx.org zone instead of a vpc zone
* Takes an AWS id and secret to query another account for instance info
* Adds some safe guards around duplicate dns entries
* Creates an ban list for elbs

make `bundle install` stop requiring a password in /edx/app/forum

adding hipchat to top-level req file, pinning ver

Adding bash wrapper for hipchat feature

Fixes to abbey external playbook support