d2e247d odhcp6c: align further with RFC8415
ce83a23 dhcpv6: avoid parsing unncessary IAs
b079733 dhcpv6: set cnt to correct IOV enum
41494da dhcpv6: get rid of request_prefix
f7437e4 dhcpv6: sanitize option request list
Signed-off-by: Hans Dedecker <dedeckeh@gmail.com>