Bringing over fab files from the old sysadmin repo

Attempted to strip out files and tasks we no longer
need.  There is more work to be done
Adding fab requirements file
Changes to make this run on @jbau 's machine

* remove capa from requirements, bump versions of dogapi and simplejson
* comment out stuff done to /etc/facter
* comment out pkg_version() b/c it needs  '../version-script/version.py'
undo accidental inclusion of playbook changes
adding version-script
Merge remote-tracking branch 'origin' into jarv/fabric-for-deploys
removing capa
new directory structure for requirements
resolving merge conflicts
Merge pull request #79 from edx/jarv/fab-new-requirements

new directory structure for requirements
Merge pull request #80 from edx/jarv/fabric-for-deploys

Jarv/fabric for deploys