DHCPv6: Rename Option constants to CamelCase

[get9]

To appease linters. All changes were made using global find + replace, but I recommend looking over option_types.go to see all new option names.

[codecov]

Codecov Report

Merging #106 into master will not change coverage.
The diff coverage is 55.4%.

@@           Coverage Diff           @@
##           master     #106   +/-   ##
=======================================
  Coverage   61.68%   61.68%           
=======================================
  Files          68       68           
  Lines        3064     3064           
=======================================
  Hits         1890     1890           
  Misses       1068     1068           
  Partials      106      106

Impacted Files	Coverage Δ
dhcpv6/modifiers.go	30.3% <0%> (ø)	⬆️
dhcpv6/option_nii.go	0% <0%> (ø)	⬆️
dhcpv6/option_prefixdelegation.go	0% <0%> (ø)	⬆️
dhcpv6/dhcpv6relay.go	60% <100%> (ø)	⬆️
dhcpv6/option_serverid.go	71.42% <100%> (ø)	⬆️
dhcpv6/option_userclass.go	75.67% <100%> (ø)	⬆️
dhcpv6/option_clientid.go	71.42% <100%> (ø)	⬆️
dhcpv6/option_statuscode.go	72.72% <100%> (ø)	⬆️
dhcpv6/option_elapsedtime.go	88.88% <100%> (ø)	⬆️
dhcpv6/option_relaymsg.go	82.6% <100%> (ø)	⬆️
... and 14 more

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[insomniacslk]

This looks good to me. I went through option_types.go and it also looks good

[insomniacslk]

and despite the coverage didn't change, this isn't letting me merge the PR :(

[insomniacslk]

Ah I see - there are merge conflicts. @get9 can you look at that? I think that is caused by another PR that I merged

[get9]

Fixed merge conflict

[insomniacslk]

Thanks!