Cherry-pick #20469 to 7.x: Fix cisco asa/ftd parsing of msgs 106102/106103

[adriansr]

Cherry-pick of PR #20469 to 7.x branch. Original message:

What does this PR do?

Updates the parsers for messages 106102 and 106103 in the shared Cisco asa/ftd pipeline.

Why is it important?

The documentation on messages 106102 and 106103 didn't match the actual format used by devices. This is causing errors when trying to ingest those messages.

Checklist

• My code follows the style guidelines of this project
• [ ] I have commented my code, particularly in hard-to-understand areas
• [ ] I have made corresponding changes to the documentation
• [ ] I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

Logs

The error this fixes:

(status=400): {
    "type":"mapper_parsing_exception",
    "reason":"failed to parse field [destination.port] of type [long] in document with id '4lFGv3MBi145cg_j1NOE'. Preview of field's value: 'hit-cnt'",
    "caused_by":{
      "type":"illegal_argument_exception",
      "reason":"For input string: \"hit-cnt\""
    }
  }

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Pinging @elastic/siem (Team:SIEM)

[elasticmachine]

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Build stats

• Build Cause: [Pull request #20493 updated]

• Start Time: 2020-08-07T08:13:11.379+0000

• Duration: 56 min 51 sec

Test stats 🧪

Test	Results
Failed	0
Passed	2434
Skipped	385
Total	2819