[kio] src/ioslaves/file/kauth: Do not cache root password for the whole session

[chinmoy ranjan]

>It was pointed out in D6198 that
>there's
>no such thing as persistence in
>polkit,

Persistence =session or always both are same and will cache the password
for 5 mins.

>however as David mentioned, we don't
>want the authorization to last
>the whole session

In response to David's comment I added the code for warning dialogs. Untill
the warning dialog is shown the helper won't be called. So privilege
execution is not possible in unit tests and background jobs.
TBH I can't see how any application will bypass the prompt. Maybe I am
wrong. Can you elaborate on the potential risks?
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