Update Personal space key when Updating the username

As we know, according to this feature request we cannot change Space Keys in Confluence yet.

However, when we create a Personal Space, it will retrieve the space key according to the username. Instead of that, this feature request is to update the personal space key automatically (or through a re-index) according to the new username change. For example:

1. Create a Personal Space for user gdecampos (retrieving the key gdecampos)
2. Change the username to giuliano
3. The Space Key will not change