[PATCH] Improve provision performance

[Andrew Bartlett]

G'Day,

The attached patches fix a number of major performance issues in our
provision.  I pushed these over the weekend, but it had a deadlock that
caused trouble for autobuild.  I've found, reproduced and removed that
in the amened patch attached.

We now provision in around 10 seconds. 

I'm running a full autobuild on the Catalyst Cloud just to make sure.

Please review/push!

Thanks,

Andrew Bartlett
-- 
Andrew Bartlett
https://samba.org/~abartlet/
Authentication Developer, Samba Team         https://samba.org
Samba Development and Support, Catalyst IT   
https://catalyst.net.nz/services/samba



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