honghaiz cec0a08275 Add a new interface for creating a udp socket in which it binds the socket to a network if the network handle is set.
Plus, in stunport, turnport and allocation sequence, create a socket using the new interface.

BUG=

Review URL: https://codereview.webrtc.org/1556743002

Cr-Commit-Position: refs/heads/master@{#11279}
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