[reSIProcate] RADIUS for reSIProcate/dum

[Daniel Pocock <daniel@xxxxxxxxxxxxxxxxxxxxx>]

I've added the following, it may be useful if someone reviewed this code 
given that it has security implications:

rutil/RADIUSDigestAuthenticator - utility class for RADIUS

resip/dum/RADIUSServerAuthManager - an implementation of 
ServerAuthManager using RADIUS

The utility class is largely based on code from auth_radius in SER - 
thanks to Jan Janak for allowing this code to be re-used under a 
BSD-like license.

Regards,

Daniel

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