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Description of problem:
Many times a user will have a http/s proxy set in their bash ENV and when wget runs for Candlepin to check the services the installer will bomb out. Please add a check to make the installer let a person know there is a proxy set before running and resulting in a error.

Version-Release number of selected component (if applicable):
6.1/6.2

How reproducible:


Steps to Reproduce:
1. set http/https proxy env 
2. run katello-installer 
3. watch it bomb out

Actual results:
wget fails on candlepin check which causes installer to fail

Expected results:
an error telling me i have a proxy env set

Additional info:

PR: https://github.com/Katello/katello-installer/pull/353

*** Bug 1334118 has been marked as a duplicate of this bug. ***

Verified on snap 10:

[root@jsherrill-test ~]# http_proxy=http://foobar.com:9934  satellite-installer --disable-system-checks
Please unset the following environment variables before running the installer: http_proxy, https_proxy, ssl_cert_file
Your system does not meet configuration criteria
[root@jsherrill-test ~]# https_proxy=http://foobar.com:9934  satellite-installer --disable-system-checks
Please unset the following environment variables before running the installer: http_proxy, https_proxy, ssl_cert_file
Your system does not meet configuration criteria

Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA.

For information on the advisory, and where to find the updated files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHSA-2018:0336