Append actions to secrets

[yuki]

Right now, when a secret is locked, we append a json parameter "username" to the secret, to know who has locked it. The idea is to know who and what was the last action has done.

There should be new parameters, with the secret itself:

• action: what action was done when saving the secret
• who/by: who has done the last action when saving the secret.
• locked_by: to know if the secret is locked (the current "username".

In the future, when the admin area has done, there will be an option to delete historic backups.

With this, we have an historic of the secret, something like:

Current: 2017-12-01 8:44 {action: closed, by: username2, secret: ...., locked_by: null}
Backup: 2017-12-01 8:43 {action: updated, by: username2, secret: ...., locked_by: username2}
Backup: 2017-12-01 8:40 {action: locked, by: username2, secret: ...., locked_by: username2}
Backup: 2017-12-01 8:40 {action: unlocked, by: username2, secret: ...., locked_by: null}
Backup: 2017-12-01 8:35 {action: auto-saved, by: username1, secret: ...., locked_by: username1}
Backup: 2017-12-01 8:32 {action: updated, by: username1, secret: ...., locked_by: username1 }
Backup: 2017-12-01 8:30 {action: created, by: username1, secret: ...., locked_by: username1}

[yuki]

All the new secrets will have those options with the previous commit. I must create the "log" section in the admin area to visualize this.

The idea is to have the actual secret tree, select one, and visualize all this info. For this, I must read all the secret's backup to read the options.