[dev] Patch for IMP - Add a preference to choose if you want to do maintenance operations

[Chuck Hagenbuch]

Quoting Julian Jares <julian@jares.com.ar>:

> Since I see people asking for it, and I actually use it, here is an
> user option that allows users to skip maintenance every time... short
> patch...

Committed to HEAD and merged to RELENG_3, thanks!

-chuck

--
Charles Hagenbuch, <chuck@horde.org>
"A dream which helps you to live your reality with dignity
 and justice is a good dream." - Tariq Ramadan