Remove TLSv1 from the list of accepted protocols.

Fixes #2666 (closed)

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merged

mentioned in commit 65224ad5

I believe this broke our windows runner; after the server upgrade to gitlab 10.0.1 the windows runner (9.5 on windows server 2012) started getting ssl unknown protocol warnings. I resolved this by re-enabling TLSv1 in the gitlab.rb line nginx['ssl_protocols'] = "TLSv1 TLSv1.1 TLSv1.2"