Fix firewall rules - Cisco Devices - (PR v3.12)

[h0rv4th]

Fixes #208

Hello team,
The firewall drop rules aren't working for Cisco devices, because they have deny action instead of drop.

Here are some samples for Cisco devices.

3924923: *Oct  6 03:32:04.114 gmt: %SEC-6-IPACCESSLOGP: list bcv_out denied tcp 10.0.3.100(50150) -> 192.168.216.1(443), 1 packet 

Oct 03 2018 17:34:08: %ASA-4-106023: Deny udp src office:1.1.1.1/3217 dst FE_xUI:Server_Windows/15000 by access-group "ACLoffice" [0x0, 0x0]

Original PR: #209
Author: @migruiz4