Define a proxy for plugin installation

[robin13]

Ability to define a proxy port like this

[barryib]

Hello, I have problem with proxy also. I'm going to work on this on our installation, so would like to know what direction to take in order to contribue back to the community.

So what do you think about these proposals:

1- Define proxy for all plugins installation at once

es_plugins_proxy_host: proxy.example.com
es_plugins_proxy_port: 8080

2- Define proxy for particular plugin

es_plugins:
  - plugin: license
  - plugin: marvel-agent
  - plugin: lmenezes/elasticsearch-kopf
    version: master
    proxy_host: proxy.example.com
    proxy_port: 8080

[electrical]

I think it makes sense to have es_proxy_host and es_proxy_port so we can re-use those variables anywhere in the future.
That way its not limited to the plugins.
the proxy_host and proxy_port vars at the es_plugins sections looks good.

[gingerwizard]

Agreed we should support this +1
Happy to add in next release.

[gingerwizard]

Closed with pull request 60