MINOR: quic: properly finalize thread rebinding

MINOR: quic: properly finalize thread rebinding

When a quic_conn instance is rebinded on a new thread its tasks and
tasklet are destroyed and new ones created. Its socket is also migrated
to a new thread which stop reception on it.

To properly reactivate a quic_conn after rebind, wake up its tasks and
tasklet if they were active before thread rebind. Also reactivate
reading on the socket FD. These operations are implemented on a new
function qc_finalize_affinity_rebind().

This should be backported up to 2.7 after a period of observation.