Allow optional space between sysloghost and colon. #2
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Closes elastic/logstash#2101. If a Cisco ASA has a logging
device-id set, the syslog message emitted contains an additional space
after the device-id and therefore does not match the grok pattern
CISCO_TAGGED_SYSLOG. An optional space should be allowed by the pattern
between the device-id (which is captured as sysloghost) and the colon
character.