The RSA engine (used by pony) has to wait for a response from the

The RSA engine (used by pony) has to wait for a response from the
privileged process (lka) and receive the imsgs in a while loop
synchronously.  But the lka also sends other imsgs (DNS etc.) that can
still be queued up in the buffer when waiting for the RSA response.
This only happens under load with many concurrent connections.  For
now, we just call the pony imsg handler for non-RSA imsgs that are
already in the buffer.

ok gilles@ eric@ blambert@