[PATCH] Emit warnings from Job, and forward them adequately in ForwardingSlaveBase

[Kévin Ottens]

Hello,

Could someone review the attached patch?

It basically adds a warning() signal to Job class, and allow to avoid Job 
instances to display themselves warning messages. The resulting message box 
was crashing forwarding ioslaves.

Moreover ForwardingSlaveBase class is modified to forward the new warning() 
signal coming from Job instances.

It is needed in order to close BR:105369

I wait approval before committing.

Regards.
-- 
Kévin 'ervin' Ottens, http://ervin.ipsquad.net
"Ni le maître sans disciple, Ni le disciple sans maître,
Ne font reculer l'ignorance."
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