Pcapng::SHB: fix endianness when reading a file of different endianness than one defined at SHB object creation.
Pcapng::SHB: fix endianness when reading a file of different endianness than
one defined at SHB object creation.

In #read, call new method #force_endianness instead of #set_endianness
and #init_fields, which sets args but not self.

sdaubert/packetfu