Get rid of isc_socket_{recv,sendto}v{,2} functions from dig
Dig (dighost.c) is the only place we're using iovec-like versions of socket_recv/send functions, we should get rid of those as that'd simplify the codebase.
Dig (dighost.c) is the only place we're using iovec-like versions of socket_recv/send functions, we should get rid of those as that'd simplify the codebase.