Add option to track memory allocation with OpenSSL

[bcall@l1 ~]$ sudo traffic_line -s proxy.config.res_track_memory -v 2
[bcall@l1 ~]$ sudo kill -sigusr1 $(pidof traffic_server); tail traffic.out
Total Allocated      | Total Freed          | Currently Allocated  | Type
---------------------|----------------------|----------------------|----------------------
         18437960662 |          17181254510 |           1256706152 | SSL Allocated Memory
---------------------|----------------------|----------------------|----------------------