MINOR: quic: filter show quic by address

MINOR: quic: filter show quic by address

Add the possibilty to restrict show quic output to only a single
connection. This is done by specifying a quic_conn address pointer.

Default format selection has evolved with it. Indeed, it seems more
fitting to use full format by default when filtering on a connection.
However, it's still possible to revert to the original oneline format
with it by specifying it explicitely.