[3.13] gh-119461: Fix ThreadedVSOCKSocketStreamTest (#119465) (#119479)

gh-119461: Fix ThreadedVSOCKSocketStreamTest (#119465)

Fix ThreadedVSOCKSocketStreamTest: if get_cid() returns the host
address or the "any" address, use the local communication address
(loopback): VMADDR_CID_LOCAL.

On Linux 6.9, apparently, the /dev/vsock device is now available but
get_cid() returns VMADDR_CID_ANY (-1).

(cherry picked from commit e94dbe4ed83460f18bd72563c5f09f6cdc71f604)