v6: give proper names to some common OptionCodes

[hugelgupf]

Signed-off-by: Chris Koch [email protected]

[codecov]

Codecov Report

Merging #348 into master will decrease coverage by 0.15%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master     #348      +/-   ##
==========================================
- Coverage   72.11%   71.95%   -0.16%     
==========================================
  Files          79       79              
  Lines        3998     3969      -29     
==========================================
- Hits         2883     2856      -27     
+ Misses        955      954       -1     
+ Partials      160      159       -1

Impacted Files	Coverage Δ
dhcpv6/types.go	90% <ø> (ø)	⬆️
dhcpv6/option_iaprefix.go	88.57% <0%> (-1.43%)	⬇️
dhcpv6/option_prefixdelegation.go	100% <0%> (ø)	⬆️
dhcpv6/option_nontemporaryaddress.go	100% <0%> (ø)	⬆️
netboot/rtnetlink_linux.go	50% <0%> (ø)	⬆️
dhcpv6/option_iaaddress.go	100% <0%> (ø)	⬆️

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[pmazzini]

lgtm

[hugelgupf]

Is go/tip broken?

[pmazzini]

Is go/tip broken?

Yes, I think it is a golangci-lint issue: golangci/golangci-lint#896

[insomniacslk]

The original names were coming from various RFCs, but I am OK with more readable names