Request for two small contrib extensions

[tmortagne]

@ClemensRobbenhaar

What the extension does is defining a scheduler job that looks for pages with an XWiki.LDAPProfileClass object and then checks if the corresponding user in the LDAP still exists.
If this is not the case, it removes the corresponding user profile page and optionally moves all “document creator”, “document author” and “comment author” entries matching that user to a (configurable) placeholder account.

I feel it make sense as a new module in GitHub - xwiki-contrib/ldap: Various tools to manipulate LDAP servers in XWiki..