Rename icmp internals
Rename icmp internals

Rename internal icmp data to hide them from the user. Also renamed the
ip packet to be able to access it doing 'icmp.ip'.

lcheylus/haka,LubyRuffy/haka,nabilbendafi/haka,lcheylus/haka,haka-security/haka,LubyRuffy/haka,Wingless-Archangel/haka,lcheylus/haka,haka-security/haka,nabilbendafi/haka,Wingless-Archangel/haka,haka-security/haka,nabilbendafi/haka