Update pcap parser processing rate to 1 in 10 archives

[cristinaleonr]

Update pcap parser to process fewer archives (i.e., 1 in 10)

A similar concept exists in the legacy pipeline with the TASK_FILE_SKIP setting (e.g., https://github.com/m-lab/etl-gardener/blob/master/k8s/data-processing-cluster/deployments/etl-gardener-ndt.yml#L52)

Testing comparing the processing the logs to the archive entries

Log https://pantheon.corp.google.com/logs/query;query=resource.type%3D%22k8s_container%22%0Aresource.labels.project_id%3D%22mlab-sandbox%22%0Aresource.labels.location%3D%22us-east1%22%0Aresource.labels.cluster_name%3D%22data-processing%22%0Aresource.labels.namespace_name%3D%22default%22%0Alabels.k8s-pod%2Frun%3D%22etl-parser%22%20severity%3E%3DDEFAULT;timeRange=2021-08-12T17:13:17.000Z%2F2021-08-12T17:13:18.000Z;cursorTimestamp=2021-08-12T17:13:17.602104577Z?project=mlab-sandbox

Archive https://pantheon.corp.google.com/storage/browser/archive-measurement-lab/ndt/pcap/2021/07/29?pageState=(%22StorageObjectListTable%22:(%22f%22:%22%255B%255D%22))&project=measurement-lab&prefix=&forceOnObjectsSortingFiltering=false

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 6599

• 18 of 18 (100.0%) changed or added relevant lines in 3 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.07%) to 63.047%

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Totals
Change from base Build 6588:	0.07%
Covered Lines:	3576
Relevant Lines:	5672

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💛 - Coveralls

[cristinaleonr]

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active/active_test.go, line 112 at r3 (raw file):

Previously, stephen-soltesz (Stephen Soltesz) wrote…

Please call this "prefix". In the GCS context the "bucket" is the term to describe the thing that contains all of the named objects inside the bucket. The path prefix here is part of naming the full paths for obj1-11.

Done.