socket_wrapper: add SOCKET_WRAPPER_ALLOW_DGRAM_SEQPACKET_FALLBACK support
If the server of a IPPROTO_QUIC socket used SOCK_SEQPACKET it is desired that a client using IPPROTO_UDP in connected mode is able to talk to the server.
So we need to catch EPROTOTYPE from libc_connect() and reopen the socket using SOCK_SEQPACKET and retry libc_connect().
Signed-off-by: Stefan Metzmacher metze@samba.org