Master Branch update varnish cache repo setup routine check for connectivity first

update varnish cache repo setup routine check for connectivity first

- added a check for varnish cache repo download and setup routine so skip it if can not connect to packagecloud.io https://community.centminmod.com/threads/php-nginx-not-installed-by-default.14496/page-2#post-62246

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Centmin Mod Github Master branch

Master branch is where most recent commits are made as at May 24, 2015.

• Branch: https://github.com/centminmod/centminmod
• Commit History: https://github.com/centminmod/centminmod/commits/master

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