Also pass a flag to the delete callback to tell it if this is a normal
entry removal or we are cleaning up the tbale definitively.

Level 3 was far too low for mostly-useless messages

The retun values are still not directly used with ldap libraries that still do
their own name resolution, but this patch introduces a very basic framework to
have a multiple providers in one domain use and share a single failover
service if they want to.

This way we do not need to check for id ranges on every search.

- save current ccache file to sysdb
- use the saved ccache file if the user has running processes
- create an empty ccache if offline
- return enviroment variables if offline