modified cisco pattern to support cisco switches

The existing pattern matched the cisco firewall syslog format found here: http://www.cisco.com/c/en/us/td/docs/security/asa/syslog-guide/syslogs.pdf

In my environment, I had a need to also include cisco switches (specifically cisco 2960 devices). The format for that can be found here: http://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst2960/software/release/12-2_25_fx/system/messages/2960smg.pdf