Enable HTTP/2 on Dwellers

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On RHEL 7, OpenSSL is at 1.0.1. This is an issue as it lacks ALPN, shipped with 1.0.2, and as such, HTTP/2 won't work on Chrome, who removed support for NPN.

More context at https://www.keycdn.com/support/alpn/ and https://ma.ttias.be/chrome-drops-npn-support-for-http2-alpn-only/

$ nginx -V
nginx version: nginx/1.10.2
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-4) (GCC)
built with OpenSSL 1.0.1e-fips 11 Feb 2013

So currently, we've deployed HTTP/2 + NPN and we should use a nginx compiled against a more recent OpenSSL version to get ALPN too.