Define a proxy for plugin installation

[barryib]

Address the issue ansible-elasticsearch #4 which add proxy for plugin installation and more generally es_proxy_host and es_proxy_port for global usage.

Right now, it’s only used for plugins installation. In the futur, it can be used (or defined) in the java_opts within the default file for instance (elasticsearch.j2)

[elasticsearch-release]

Jenkins standing by to test this. If you aren't a maintainer, you can ignore this comment. Someone with commit access, please review this and clear it for Jenkins to run; then say 'jenkins, test it'.

[electrical]

jenkins, test it

[electrical]

Thank you so much for the contribution! I'll let jenkins do its magic.
In the meantime could you sign the CLA?
Thanks!

[barryib]

@electrical I signed the CLA, but I don't know if it applied on this PR

[barryib]

Never mind. I was in the hurry :)

[electrical]

jenkins, test it

[electrical]

failed some runs so trying again.

[barryib]

@electrical I think there are version incompatibility between net-ssh and ruby during tests. In all failed tests, I got this error: Gem::InstallError: net-ssh requires Ruby version >= 2.0.

[electrical]

Yeah. will do some tests locally and fix the Gemfile.

[gingerwizard]

Hi @barryib picking this up as @electrical isn't focused on this anymore. Lets get it tested again and ill see if i can resolve.

[gingerwizard]

jenkins, test it

[gingerwizard]

jenkins, test it

[gingerwizard]

@barryib If the tests pass ill merge

[gingerwizard]

jenkins, test it

[gingerwizard]

LGTM

[elasticsearch-release]

Jenkins standing by to test this. If you aren't a maintainer, you can ignore this comment. Someone with commit access, please review this and clear it for Jenkins to run; then say 'jenkins, test it'.