Fixed Cisco ASA firewalls patterns for outbound and inbound directions

There is a problem with the built-in patterns for Cisco ASA firewalls. When the direction is "outbound", the src_ip/src_port and dst_ip/dst_port are reversed. This PR fixes this.
The Logstash Cookbook should be updated for this purpose, see #1369.

I agree with your changes to 302020 and 302021 because with ICMP, the format is talking about foreign and local IPs, the meaning of which depends on the direction when you map foreign/local to source/destination.

I had originally chosen to call it src/dst instead of laddr/faddr so it would be consistent with other types of logs in a single Kibana table/dashboard, but didn't think through the details here.