Godaddy integration and minor fixes

[craig-willis]

This PR fixes multiple bugs in the terraform process and implements GoDaddy integration for DNS and wildcard cert generation.

• Fixes #9 (change default flavor)
• Fixes #10 (dependency change)
• Fixes #18 (Godaddy DNS integration)
• Partial implementation for girder_wholetale/issues/59 (wildcard support in traefik)

Test case Preconditions:

• Valid rclone config (rclone --config rclone.conf config)
• Configure Globus and GoDaddy API key/secret in variables.tf
• Configure subdomain (e.g., "test")

Confirm #10 and #9:

• View stack.tf, confirm deploy_stack depends on provision_fileserver
• View variables.tf, confirm default flavor is m1.medium

Provision the cluster: terraform apply

Restore the development database on fileserver:

ssh <nfs node>
docker run -it --network wt_mongo -v /mnt/home:/backup -v /home/core/rclone/:/conf wholetale/backup bash
restore.sh -c dev -d 20180416
init-mongo.sh <subdomain>.wholetale.org <globus_key> <globus_secret>

Restart Girder on master:

docker service  scale wt_girder=0
docker service  scale wt_girder=1

Confirm #18:

• Go to GoDaddy DNS management interface, confirm A record exists and points to correct IP address
• Open browser to https://dashboard.subdomain.wholetale.org

Confirm girder_wholetale/issues/59:

• Go to https://dashboard.subdomain.wholetale.org
• View certificate, should be for *.subdomain.wholetale.org and issued by Let's Encrypt
• Launch tale, confirm access via https

Notes:

• GoDaddy API does support delete so DNS records must be manually removed after destroy

[Xarthisius]

* Error running command 'docker run -v `pwd`/scripts:/scripts craigwillis/wt-python python scripts/godaddy-update-dns.py -k 9jNJFcjmEuu_AAJFBRcBTwPBu6kaZXuK8n -s AAJHYrfBh6VYtJTuoKbrNv -d wholetale.org -n xarth -a 141.142.209.195': exit status 125. Output: Unable to find image 'craigwillis/wt-python:latest' locally

docker: Error response from daemon: pull access denied for craigwillis/wt-python, repository does not exist or may require 'docker login'.

[craig-willis]

Updated dns.tf to use suggested jfloff/alpine-python:2.7-slim image instead of my not-useful homegrown.

[Xarthisius]

It's working great, thanks @craig-willis !