Insights snippet - Add --test-connection
If there is an issue with Foreman's Insights API,
insights-client --register command will fail with really long ugly HTML error.
Running `insights-client --test-connection` we can catch the error with
nice output like this:
Running Connection Tests... === Begin Upload URL Connection Test === Connection failed === End Upload URL Connection Test: FAILURE === === Begin API URL Connection Test === Connection failed === End API URL Connection Test: FAILURE === Connectivity tests completed with some errors See /var/log/insights-client/insights-client.log for more details.