add Bosh Backup Restore scripts

[ntdt]

Add BBR scripts based on gogs backup/restore commands.

[drnic]

Cool. I wonder if bbr backup/restore scripts is something we can test via CI

[ntdt]

I think that we can test BBR scripts, but we need some initial data created inside gogs, e.g. a test-repository, and some script to create/delete a repository in Gogs. Steps of test based on this http://docs.cloudfoundry.org/bbr/bbr-devguide.html#testing

• Create a test repository
• Launch bbr backup
• Delete test repository
• Launch bbr restore
• Verify if test repository exists

[drnic]

Also, if you're interested - can you create a ci/release_notes.md with the changes and then I can more easily push this thru CI and cut new PR.

I'm on the road and can more easily click buttons on CI than write good release notes :)