Use /etc/environment for proxy settings in docs

[slagle]

When using edpm_bootstrap_command to set system wide proxy settings,
show an example using /etc/environment.

Jira: OSPRH-14548
Signed-off-by: James Slagle jslagle@redhat.com

[ratailor]

lgtm

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rabi, slagle

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[openshift-ci]

@slagle: The following test failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/openstack-operator-build-deploy-kuttl	5472fb3	link	unknown	/test openstack-operator-build-deploy-kuttl

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