[cisco_ios] Fix FQDN parsing

[aleksmaus]

Proposed commit message

[cisco_ios] Fix FQDN parsing

Added '.' dot character to the CISCO_HOSTNAME allowed characters and increased length to 255 characters total, since this is the max length of FQDN.

Checklist

• I have reviewed tips for building integrations and this pull request is aligned with them.
• I have verified that all data streams collect metrics or logs.
• I have added an entry to my package's changelog.yml file.
• I have verified that Kibana version constraints are current according to guidelines.
• I have verified that any added dashboard complies with Kibana's Dashboard good practices

Related issues

• Closes [CISCO_IOS]: Custom grok pattern CISCO_HOSTNAME cannot handle FQDNs #11436

[elastic-vault-github-plugin-prod]

🚀 Benchmarks report

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[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
100.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[elasticmachine]

💚 Build Succeeded

• Buildkite Build
• Commit: bae1b4fbbc24783cdb5e8854cabf57b75041bd70

cc @aleksmaus

[elasticmachine]

Pinging @elastic/sec-deployment-and-devices (Team:Security-Deployment and Devices)

[elastic-vault-github-plugin-prod]

Package cisco_ios - 1.28.1 containing this change is available at https://epr.elastic.co/package/cisco_ios/1.28.1/