Add folder permissions backup

[jartigag]

I wrote the get_folder_permissions and update_folder_permissions functions, and everything else to make the tool work with the Grafana Permissions API (also fix the "organaizations" typo).

I started from the fork commented in #90, so now I see restore.py may have diverged, specially in that restore_from_dir function.

¿How should I proceed?

[acjohnson]

@jartigag can you rebase against master and ensure it works properly there? Why is the fork mentioned in #90 important to the folder permissions changes you are proposing?

[jartigag]

I'll try the rebase against master.

The fork isn't relevant to the folder permissions changes, but I started from there and I saw that difference in restore.py when i opened this PR.

Let's see if I manage to make it right.

[acjohnson]

@jartigag let's give this one more re-base against master and we should be able to get it merged

[jartigag]

Why it is unused?

[acjohnson]

Good question @jartigag you wrote it lol... If you aren't sure why it is there then I'll assume it was a mistake and delete. Thanks!

[jartigag]

Sorry, what I've meant is I don't understand why you say it's unused.. I implemented it here https://github.com/naudit/grafana-backupper and I used it in production. I just wanted to merge it into the original tool too.

[acjohnson]

ok... but your fork has a function called restore_from_dir that doesn't mean this project should also have it as dead code... I don't see any correlation between your project grafana-backupper and this project other than you forked it... or am I missing something?

[acjohnson]

I think I see what you did, you meant to add 'folder_permissions': update_folder_permissions, to the restore_functions = collections.OrderedDict() but instead you created another dictionary inside of restore_from_dir which isn't being called anywhere... I'll see if I can combine the two

[acjohnson]

af51467 solves this and the restore_from_dir function is now deleted