add OpenSSL RAND_cleanup() on OpenSSL shutdown 
add OpenSSL RAND_cleanup() on OpenSSL shutdown 

- to securely erase the memory used by the PNRG
- also rework 2 comments in OpenSSL init
eXcomm/LibertyCoin,bankonme/LibertyCoin,eXcomm/LibertyCoin,eXcomm/LibertyCoin,bankonme/LibertyCoin,bankonme/LibertyCoin,bankonme/LibertyCoin,eXcomm/LibertyCoin,bankonme/LibertyCoin,eXcomm/LibertyCoin