Improving the sandbox update script

This modifies the edx_ansible role to dump a clean var
file on disk that can be used for subsequent update runs
so that config vars will not be lost

also changes the ansible tmp directory to /var/tmp which is a better
location than using $HOME (used for debugging mostly)
install the complete edx_ansible role
Merge remote-tracking branch 'origin' into jarv/dump_vars
adding the missing dumpall.yml.j2 file
removing remote_tmp override
adding ease and certs to version removal
Adding agard tags to our subnets.
formatting.
syntax fixes
subnet tags for Asgard.
Merge pull request #646 from edx/e0d/cf-for-asgard

Adding agard tags to our subnets.
Merge pull request #640 from edx/jarv/dump_vars

Improving the sandbox update script
missing deploy tag on deploy.yml tasks
Merge pull request #652 from edx/jarv/missing-deploy-tag

missing deploy tag on deploy.yml tasks
Merge remote-tracking branch 'origin' into jarv/no-deploy
changing default instance type for ubuntu ami to m1.medium