fix(ipv4): More fragments flags was incorrectly reported as Evil (flags were reverded)
fix(ipv4): More fragments flags was incorrectly reported as Evil (flags
were reverded)

The flags are in order, from high order to low order:
* bit 0: Reserved; must be zero.
* bit 1: Don't Fragment (DF)
* bit 2: More Fragments (MF)

Also added some more commenting to the Evil flag.

levigross/gopacket,1d4Nf6/gopacket,lokikiller/gopacket,ross-williams/gopacket,rouzier/gopacket,dazer-chen/gopacket,UIKit0/gopacket-1,adriantam/gopacket,1d4Nf6/gopacket,packetbeat/gopacket,xuzhaokui/gopacket,hkwi/gopacket,wheelcomplex/gopacket,vtolstov/gopacket,clarktrimble/gopacket,nhooyr/gopacket,urso/gopacket,vtolstov/gopacket,chapayGhub/gopacket,hkwi/gopacket,LrsK/gopacket,scroot/gopacket,packetbeat/gopacket,packetbeat/gopacket,ross-williams/gopacket,breml/gopacket,skyportsystems/gopacket,packetb-old/gopacket,breml/gopacket,LrsK/gopacket,LrsK/gopacket,chapayGhub/gopacket,packetbeat/gopacket,google/gopacket,levigross/gopacket,ross-williams/gopacket,lokikiller/gopacket,clarktrimble/gopacket,nhooyr/gopacket,josephcopenhaver/gopacket,dazer-chen/gopacket,josephcopenhaver/gopacket,ccordes-snaproute/gopacket,wheelcomplex/gopacket,xuzhaokui/gopacket,dutchcoders/gopacket,google/gopacket,UIKit0/gopacket-1,packetb-old/gopacket,rouzier/gopacket,aeppert/gopacket,levigross/gopacket,1d4Nf6/gopacket,google/gopacket,packetb-old/gopacket,dutchcoders/gopacket,urso/gopacket,scroot/gopacket,zerklabs/gopacket,chapayGhub/gopacket,aeppert/gopacket,nhooyr/gopacket,skyportsystems/gopacket,breml/gopacket,adriantam/gopacket,clarktrimble/gopacket,dutchcoders/gopacket,ccordes-snaproute/gopacket,packetb-old/gopacket,urso/gopacket,dazer-chen/gopacket,rouzier/gopacket,ccordes-snaproute/gopacket,aeppert/gopacket,hkwi/gopacket,zerklabs/gopacket,wheelcomplex/gopacket,josephcopenhaver/gopacket,xuzhaokui/gopacket,vtolstov/gopacket,lokikiller/gopacket,adriantam/gopacket,UIKit0/gopacket-1,zerklabs/gopacket,skyportsystems/gopacket,scroot/gopacket