UPGRADE: Zeek Ethercat plugin

[dougburks]

Upgrade to latest Zeek Ethercat plugin:
cisagov/icsnpp-ethercat#16

This resolves a long standing issue in the plugin where it was logging all ARP traffic by default:
cisagov/icsnpp-ethercat#5

Since it no longer logs all ARP traffic by default, we can remove the ecat_arp_info exclusion from our Zeek defaults.yaml:
https://github.com/Security-Onion-Solutions/securityonion/blob/2.4/main/salt/zeek/defaults.yaml

Remove the ARP page from documentation:
https://docs.securityonion.net/en/2.4/arp.html

[dougburks]

Removed ARP page from documentation:
Security-Onion-Solutions/securityonion-docs@b6b02e5

[dougburks]

Tested by importing a sample ethercat pcap file:
https://github.com/cisagov/icsnpp-ethercat/blob/main/tests/traces/ethercat_example.pcap

On previous versions, we would get an ecat_arp_info log:

[root@standalone ~]# ls -alh /nsm/import/37be1a6225faa3e439c513f4d2979eda/zeek/logs/
total 35M
drwxr-xr-x. 2 zeek socore 4.0K Jul 23 18:48 .
drwxr-xr-x. 5 zeek socore   48 Jul 23 18:48 ..
-rw-r--r--. 1 root root    105 Jul 23 18:48 capture_loss.log
-rw-r--r--. 1 root root   1.4K Jul 23 18:48 conn.log
-rw-r--r--. 1 root root    197 Jul 23 18:48 console.log
-rw-r--r--. 1 root root    278 Jul 23 18:48 dhcp.log
-rw-r--r--. 1 root root   1.3K Jul 23 18:48 ecat_aoe_info.log
-rw-r--r--. 1 root root   1.6K Jul 23 18:48 ecat_arp_info.log
-rw-r--r--. 1 root root    803 Jul 23 18:48 ecat_coe_info.log
-rw-r--r--. 1 root root   1.4K Jul 23 18:48 ecat_dev_info.log
-rw-r--r--. 1 root root    26M Jul 23 18:48 ecat_log_address.log
-rw-r--r--. 1 root root   8.7M Jul 23 18:48 ecat_registers.log
-rw-r--r--. 1 root root    45K Jul 23 18:48 loaded_scripts.log
-rw-r--r--. 1 root root    200 Jul 23 18:48 notice.log
-rw-r--r--. 1 root root     90 Jul 23 18:48 packet_filter.log
-rw-r--r--. 1 root root    249 Jul 23 18:48 reporter.log

On the new version, there is no ecat_arp_info log:

[root@standalone ~]# ls -alh /nsm/import/37be1a6225faa3e439c513f4d2979eda/zeek/logs/
total 35M
drwxr-xr-x. 2 zeek socore 4.0K Jul 23 17:29 .
drwxr-xr-x. 5 zeek socore   48 Jul 23 17:29 ..
-rw-r--r--. 1 root root    105 Jul 23 17:29 capture_loss.log
-rw-r--r--. 1 root root   1.5K Jul 23 17:29 conn.log
-rw-r--r--. 1 root root    197 Jul 23 17:29 console.log
-rw-r--r--. 1 root root    277 Jul 23 17:29 dhcp.log
-rw-r--r--. 1 root root   1.3K Jul 23 17:29 ecat_aoe_info.log
-rw-r--r--. 1 root root    803 Jul 23 17:29 ecat_coe_info.log
-rw-r--r--. 1 root root   1.4K Jul 23 17:29 ecat_dev_info.log
-rw-r--r--. 1 root root    26M Jul 23 17:29 ecat_log_address.log
-rw-r--r--. 1 root root   8.7M Jul 23 17:29 ecat_registers.log
-rw-r--r--. 1 root root    49K Jul 23 17:29 loaded_scripts.log
-rw-r--r--. 1 root root    200 Jul 23 17:29 notice.log
-rw-r--r--. 1 root root     90 Jul 23 17:29 packet_filter.log
-rw-r--r--. 1 root root    249 Jul 23 17:29 reporter.log