consensus and certs cached in our datadirectory: we were
caching the consensus in consensus_waiting_for_certs but then
free'ing it right after.
more bugs remain here, i think.
svn:r12369
networkstatus_vote_free(consensus_waiting_for_certs);
tor_free(consensus_waiting_for_certs_body);
consensus_waiting_for_certs = c;
+ c = NULL; /* Prevent free. */
consensus_waiting_for_certs_body = tor_strdup(consensus);
consensus_waiting_for_certs_set_at = now;
consensus_waiting_for_certs_dl_failed = 0;