Data migration for embassy slug change

pending puppet PR https://github.gds/gds/puppet/pull/725
Add org acronyms to admin drop downs

https://www.pivotaltracker.com/story/show/43042275
tweaking select fields
Merge pull request #629 from alphagov/update-for-fco-embassy

Data migration for embassy slug change

https://www.pivotaltracker.com/story/show/51980679
Merge pull request #636 from alphagov/add-org-acronyms-to-admin

Add org acronyms to admin

https://www.pivotaltracker.com/story/show/43042275