[imp] Fix for broken SQL session handlers since IMP 3.2.2

[Michael J Schout]

Chuck Hagenbuch wrote:
> Quoting Michael Schout <mschout at gkg.net>:
> 
>> Apparently the reason that getCleanSession() does not succeed in
>> changing the session id is that it calls:
>>
>> @session_destroy();
>>
>> before calling session_regenerate_id()
>>
>> If I remove the call to @destroy_session() inside getCleanSession(),
>> then the session_regenerate_id() call succeeds and the client gets
>> assigned a new session_id when they submit the login form.
> 
> 
> Okay, interesting. Try what I just committed to both HEAD and RELENG_2.

Hey Chuck.

I just pulled horde RELENG_2 from CVS, and your change fixes the 
probelm.  In other words, SQL session handlers work in horde CVS RELENG_2.

I didn't try the HEAD version, because I assume you made the same change 
there :).

Mike