Change the agent.action_seq_no storage format from number to an array (bp #174)

[mergify]

This is an automatic backport of pull request #174 done by Mergify.

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[elasticmachine]

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Build stats

• Build Cause: Pull request #191 updated

• Start Time: 2021-03-30T18:34:32.969+0000

• Duration: 4 min 22 sec

• Commit: 85824a0

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Test	Results
Failed	0
Passed	64
Skipped	0
Total	64

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