RIPD-108:  Use a self-signed certificate for peers

Quibble - the style is different from 90%+ of the ripple code - which seems to so far have these variants:

     template <class>
     custom_delete <RSA> 
     { // etc

or

     template <class>
     custom_delete<RSA> 
     { // etc

Not really sure that the extra spaces inside the <> buys you anything, anyway...