Add schema for pcap index

[cristinaleonr]

• Added new pcap datatype definition to m-lab/etl/schema
• Added pcap table creation to update-schema
• Added descriptions for PCAPRow schema

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 6556

• 10 of 12 (83.33%) changed or added relevant lines in 2 files are covered.
• 2 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.008%) to 62.869%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
schema/pcap.go	9	11	81.82%
<!--	Total:	10	12	83.33%	-->

Files with Coverage Reduction	New Missed Lines	%
active/active.go	2	89.89%
<!--	Total:	2		-->

Totals
Change from base Build 6545:	0.008%
Covered Lines:	3515
Relevant Lines:	5591

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💛 - Coveralls

[cristinaleonr]

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schema/pcap.go, line 9 at r1 (raw file):

Previously, stephen-soltesz (Stephen Soltesz) wrote…

Please add a simple docstring for this type. Does VS Code report "golint" warning? (In my interface it's a yellow curvy line under the type name).

Added, thanks!

I don't see a warning. I will look into why that is.

[cristinaleonr]

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schema/descriptions/PCAPRow.yaml, line 1 at r1 (raw file):

Previously, stephen-soltesz (Stephen Soltesz) wrote…

Hmm. It looks like all the fields used in the PCAPRow struct are defined now in the toplevel.yaml ... I think we can keep this file as a reminder, but I think it can be empty without losing any behavior we need.

Makes sense. I deleted the file contents.

[cristinaleonr]

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schema/pcap.go, line 9 at r3 (raw file):

Previously, stephen-soltesz (Stephen Soltesz) wrote…

nit: please end Go comments with a period. Paraphrasing from Effective Go, > Doc comments work best as complete sentences, ...

Done, thanks!