Expand documentation on HTTP_PROXY, HTTPS_PROXY, NO_PROXY

[juanvallejo]

Right now, current documentation covers proxy enrivonment variables by mentioning that they can be set in podSpec templates, and as part of a node's configuration. Documentation does not mention, however, that these environment variables can also be set on the environment from which an oc binary is being executed.

It would be good to expand docs (and even cli help output) to mention that these environment variables are taken into account by an oc binary, and give some use-cases on when they might be used by oc to talk to a master.

cc @gabemontero @openshift/cli-review @bparees

[openshift-bot]

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/lifecycle stale

[openshift-bot]

Stale issues rot after 30d of inactivity.

Mark the issue as fresh by commenting /remove-lifecycle rotten. Rotten issues close after an additional 30d of inactivity. Exclude this issue from closing by commenting /lifecycle frozen.

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/lifecycle rotten /remove-lifecycle stale

[bparees]

/remove-lifecycle rotten /lifecycle frozen

[bparees]

/lifecycle frozen