c9a80f Enable EDNS on recursors

Authored and Committed by crameleon a month ago
    Enable EDNS on recursors
    
    Enabled by default after PowerDNS Recursor 5.0.0, but Leap
    currently only ships 4.8.6.
    
    Signed-off-by: Georg Pfuetzenreuter <mail@georg-pfuetzenreuter.net>