Update nginx to 1.10.2
This should fix some http/2 issues. And is impacting Gemnasium's work on: https://gitlab.com/gitlab-org/gitlab-ce/issues/23599
Changelog can be found here: https://nginx.org/en/CHANGES-1.10
I propose doing this in the near term instead of: https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1623