Description of problem:
A Satellite that needs to use http proxy to connect to the internet is not able to forward the insights requests from the clients to the insights server. This is because the Foreman "rh_cloud" plugin doesn't use the configured default global content http proxy to connect to the insights server.

Version-Release number of selected component (if applicable):
foreman_rh_cloud-3.0.18.1


Steps to Reproduce:
1. In the Satellite, use the firewall to block the outgoing connection to "cert-api.access.redhat.com"

systemctl start firewalld
iptables -A OUTPUT -d <IP of cert-api.access.redhat.com> -j DROP

2. Run ping to ensure the IP is blocked successfully.

ping cert-api.access.redhat.com

3. Configure the default global content http proxy.

Web UI -> Administer -> Settings -> Content -> Default HTTP Proxy -> Select the proxy to use.

4. Ensure this http proxy is not set.

Web UI -> Administer -> Settings -> HTTP(S) proxy -> Not set

5. Login to the client, run the insights connection test.

insights-client --test-connection


Actual results:
### On client ###
GET https://satellite.example.com:443/redhat_access/r/insights/v1/branch_info
GET branch_info status: 200
Running Connection Tests...
=== Begin Upload URL Connection Test ===
Testing: https://satellite.example.com:443/redhat_access/r/insights/uploads/
HTTP Status Code: 500
HTTP Status Text: Internal Server Error
HTTP Response Text: {
  "error": {"message":"Timed out reading data from server"}
}

### OpenTimeout is raised in Satellite production.log ###
2021-06-08T15:15:02 [I|app|d7200c1e] Started GET "/redhat_access/r/insights/v1/branch_info" for XXX.XXX.XXX.XXX at 2021-06-08 15:15:02 +1000
2021-06-08T15:15:02 [I|app|d7200c1e] Processing by InsightsCloud::Api::MachineTelemetriesController#branch_info as JSON
2021-06-08T15:15:02 [I|app|d7200c1e] Completed 200 OK in 101ms (Views: 0.3ms | ActiveRecord: 16.4ms | Allocations: 11868)
2021-06-08T15:15:02 [I|app|22b260ff] Started POST "/redhat_access/r/insights/uploads/" for XXX.XXX.XXX.XXX  at 2021-06-08 15:15:02 +1000
2021-06-08T15:15:02 [I|app|22b260ff] Processing by InsightsCloud::Api::MachineTelemetriesController#forward_request as JSON
2021-06-08T15:15:02 [I|app|22b260ff]   Parameters: {"test"=>"test", "path"=>"uploads"}
2021-06-08T15:16:02 [W|app|22b260ff] Action failed
2021-06-08T15:16:02 [I|app|22b260ff] Backtrace for 'Action failed' error (RestClient::Exceptions::OpenTimeout): Timed out connecting to server
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.2/lib/restclient/request.rb:731:in `rescue in transmit'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.2/lib/restclient/request.rb:642:in `transmit'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.2/lib/restclient/request.rb:145:in `execute'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/rest-client-2.0.2/lib/restclient/request.rb:52:in `execute'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_rh_cloud-3.0.18.1/app/services/foreman_rh_cloud/cloud_request_forwarder.rb:37:in `execute_cloud_request'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_rh_cloud-3.0.18.1/app/services/foreman_rh_cloud/cloud_request_forwarder.rb:19:in `forward_request'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/foreman_rh_cloud-3.0.18.1/app/controllers/insights_cloud/api/machine_telemetries_controller.rb:17:in `forward_request'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/actionpack-6.0.3.4/lib/action_controller/metal/basic_implicit_render.rb:6:in `send_action'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/actionpack-6.0.3.4/lib/abstract_controller/base.rb:195:in `process_action'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/actionpack-6.0.3.4/lib/action_controller/metal/rendering.rb:30:in `process_action'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/actionpack-6.0.3.4/lib/abstract_controller/callbacks.rb:42:in `block in process_action'
 22b260ff | /opt/theforeman/tfm/root/usr/share/gems/gems/activesupport-6.0.3.4/lib/active_support/callbacks.rb:112:in `block in run_callbacks'
 22b260ff | /usr/share/foreman/app/controllers/concerns/foreman/controller/timezone.rb:10:in `set_timezone'
<snip>


Expected results:
Requests can be forwarded successfully through the configured default global content http proxy


Additional info:
This issue seems to be fixed upstream

https://github.com/theforeman/foreman_rh_cloud/pull/547


Each request has a open timeout of 60 seconds. Therefore, this will overload the Puma connection threads when many clients make concurrent insights requests. Causing http status 503 error to other http requests, such as YUM