Move meek-azure to the meek.azureedge.net backend and cymrubridge02 bridge.

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meek-azure has a new backend infrastructure and bridge:

https://lists.torproject.org/pipermail/tor-project/2017-January/000906.html

This patch migrates to the new settings. This is the new bridge line:
meek 0.0.2.0:3 97700DFE9F483596DDA6264C4D7DF7641E1E39CE url=https://meek.azureedge.net/ front=ajax.aspnetcdn.com

We plan to similarly migrate meek-amazon in the future. However I think
it is prudent to only do meek-azure first, in order to limit the impact
of any unexpected failure in using the new bridge.
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