Add missing EAPOLTypes to EAPOLTypeMetadata

[pyther]

EAPOLTypes 1, 2, and 4 return UnknownEAPOLType instead of EAPOLStart, EAPOLLogOff, and EAPOLASFAlert.

I'm not sure if this is the correct way to fix this. The comment under initActualTypeData() in enums.go implies that these should get out generated by gen2.go. I spent some time seeing if I could follow the logic, but being new to Go, I was unable to find any issues with the generation.

Before Patch

88:71:b1:22:a1:e1: UnknownEAPOLType v2, len 0
88:71:b1:22:a1:e1: UnknownEAPOLType v2, len 0
88:71:b1:22:a1:e1: UnknownEAPOLType v2, len 0
00:90:d0:63:ff:01: EAP v1, len 4
00:90:d0:63:ff:01: EAP v1, len 15

After Patch

88:71:b1:22:a1:e1: EAPOLLogOff v2, len 0
88:71:b1:22:a1:e1: EAPOLStart v2, len 0
88:71:b1:22:a1:e1: EAPOLStart v2, len 0
00:90:d0:63:ff:01: EAP v1, len 4
00:90:d0:63:ff:01: EAP v1, len 15

Code: https://gist.github.com/pyther/d8ad389358cffa3ef96b81105fdc6763

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[pyther]

@googlebot I signed it!

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