cisco_ios: support ingesting NTP log messages

[efd6]

What does this PR do?

See title.

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.

Author's Checklist

• [ ]

How to test this PR locally

Related issues

• Closes Pipeline fails to dissect NTP messages #7460

Screenshots

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Build stats

• Start Time: 2023-08-21T04:57:31.150+0000

• Duration: 19 min 33 sec

Test stats 🧪

Test	Results
Failed	0
Passed	13
Skipped	0
Total	13

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🌐 Coverage report

Name	Metrics % (covered/total)	Diff
Packages	100.0% (1/1)	💚
Files	100.0% (1/1)	💚 3.367
Classes	100.0% (1/1)	💚 3.367
Methods	100.0% (15/15)	💚 8.173
Lines	91.436% (331/362)	👍 3.106
Conditionals	100.0% (0/0)	💚

[elasticmachine]

Pinging @elastic/security-external-integrations (Team:Security-External Integrations)

[ShourieG]

LGTM

[elasticmachine]

Package cisco_ios - 1.18.0 containing this change is available at https://epr.elastic.co/search?package=cisco_ios