Move meek-amazon to the d2cly7j4zqgua7.cloudfront.net backend

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meek-amazon has a new CDN infrastructure:

This patch migrates to the new settings. This is the new bridge line:
meek 0.0.2.0:2 B9E7141C594AF25699E0079C1F0146F409495296 url=https://d2cly7j4zqgua7.cloudfront.net/ front=a0.awsstatic.com

Note that this CDN endpoint is different than the one that was discussed
on the tor-project mailing list (d2cly7j4zqgua7 rather than
d183ohpl22nq2f). This is because we decided to keep using the same
bridge, for now at least.
https://lists.torproject.org/pipermail/tor-project/2017-January/000906.html
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