[Building Sakai] Membership of copied site

[Branden Visser]

Hi everyone,

Sometimes when we copy a site using SiteService.addSite(String, Site), 
if the source site has dropbox installed, dropboxes for all the users on 
the source site get created as well. This is not desired, since the new 
site will definitely have a new roster.

I've narrowed this problem down to the fact that the copy process does 
not clear the new realm's provider id, so if it still provides users 
then the DropboxContextObserver generates folders for those users.

It appears as though the site-copying process does attempt to purge the 
new realm's membership, so it smells like a bug. Should this be clearing 
the provider as well?

Best,
Branden