This patch adds a RelayPortFactoryInterface that allows
for custom relay ports. The factor is added as optional argument
to BasicPortAlloctor. If none is provided a default implementation
that mimics existing behavior is created.
The patch also adds 2 stun functions, namely to copy a
StunAttribute and to remove StunAttribute's from a StunMessage.
Bug: webrtc:8640
Change-Id: I59bd51f0f5e2f8c187dff9fcf003a24c35ed037f
Reviewed-on: https://webrtc-review.googlesource.com/32600
Commit-Queue: Jonas Oreland <jonaso@webrtc.org>
Reviewed-by: Peter Thatcher <pthatcher@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#21267}
26246cac66