proto conversion tools

[gfr10598]

Support for transcribing netlink messages into protobufs.

• moves tcp enumerations from inetdiag.go
• adds INET_DIAG_... needed by new tools
• improves tests
• fixes bug in ipv4 handling of inet diag msg.

Some attribute types are not yet supported, and will be added as needed.

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This change is 

[coveralls]

Pull Request Test Coverage Report for Build 82

• 143 of 152 (94.08%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+14.7%) to 89.958%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
inetdiag/inetdiag.go	1	2	50.0%
nl-proto/tools/convert.go	142	150	94.67%

Totals
Change from base Build 59:	14.7%
Covered Lines:	215
Relevant Lines:	239

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💛 - Coveralls

[pboothe]

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Review status: 0 of 6 files reviewed at latest revision, all discussions resolved.

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nl-proto/tools/convert.go, line 15 at r3 (raw file):

	// Hack to force loading library, which is currently used only in nested test.
	_ "github.com/vishvananda/netlink/nl"

I don't understand this? Why does an include in the _test file not suffice?

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Comments from Reviewable

[gfr10598]

Review status: 0 of 6 files reviewed at latest revision, 1 unresolved discussion, all commit checks successful.

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nl-proto/tools/convert.go, line 15 at r3 (raw file):

Previously, pboothe (Peter Boothe) wrote…

I don't understand this? Why does an include in the _test file not suffice?

I have no idea. But this workaround is working, so I'm running with it.

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Comments from Reviewable

[gfr10598]

Issue #2