[network_traffic] Set title to Network Packet Capture

[andrewkroh]

What does this PR do?

Set the title of the integration to "Network Packet Capture".

Also add config options for timeout and period to the flow data stream.

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.

Screenshots

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

[elasticmachine]

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Build stats

• Start Time: 2021-09-27T14:25:34.028+0000

• Duration: 66 min 45 sec

• Commit: ca54910

Test stats 🧪

Test	Results
Failed	0
Passed	103
Skipped	0
Total	103

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[jamiehynds]

LGTM - thanks @andrewkroh