Add squid proxy

Added squid proxy service for testing http proxies.

Please start machine with:

• name: gitlab-ee-latest version: 9.3.9 edition: ee memory: 4272 squid_proxy: 3.3.8-23 ip_address: 192.168.15.53

Confirm that gitlab_rails['ENV'] has the http_proxy values in /etc/gitlab/gitlab.rb.

Run sudo gitlab-ctl tail and log into application, application should be forwarding requests through proxy @ 127.0.0.1.

Confirm that memory is set to 4272, this overrides the default value of 4096.