Block TURN redirects to the unspecified address

A TURN server can redirect an allocation to another server with a 300
(Try Alternate) response. Redirects to loopback addresses are already
rejected, but the unspecified address (0.0.0.0 or ::) was not, even
though some platforms deliver packets sent to it to the local host.

Treat redirects to the unspecified address as errors, like redirects to
loopback. The loopback redirect test helper is generalized to cover both
cases, and the TLS variants now listen on the redirect address so that a
connection attempt would actually be detected.

Bug: chromium:502821327
Change-Id: I8937e1047917f03c5891c3d117785ff222621a58
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/507160
Auto-Submit: Tomas Gunnarsson <tommi@webrtc.org>
Commit-Queue: Tomas Gunnarsson <tommi@webrtc.org>
Reviewed-by: Fredrik Solenberg <solenberg@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#48798}