tor service:obfuscate contact email addr

• i.e. https://torstatus.info/router_detail.php?FP=855b6cfe6c20a48cf1b815b87d565df6ea93e74a&showbandwidth=true

this is asking for spam

(from redmine: created on 2013-08-14, closed on 2013-08-29, relates #2302, relates #4841)