[7.16](backport #28993) [Elastic-Agent] IUse itnernal port for local fleet server

[mergify]

This is an automatic backport of pull request #28993 done by Mergify.

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[elasticmachine]

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• Start Time: 2021-12-07T16:01:42.402+0000

• Duration: 100 min 33 sec

• Commit: cb859c6

Test stats 🧪

Test	Results
Failed	0
Passed	7069
Skipped	24
Total	7093

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[mergify]

This pull request has not been merged yet. Could you please review and merge it @michalpristas? 🙏

[mergify]

This pull request has not been merged yet. Could you please review and merge it @michalpristas? 🙏

[michalpristas]

/test