Add underscore to first part of CISCOTAG

Description

https://github.com/elasticsearch/logstash/pull/1162 adds underscore to first part of CISCOTAG, which allows it to match some tags I encountered, eg. SW_MATM-4-MACFLAP_NOTIF

Environment

None

Status

Assignee

Logstash Developers

Reporter

viq

Labels

Priority

Configure