Metrics uploading is quite fragile

[mvollmer]

The insights-client itself uploads some data to somewhere, using the MetricsHTTOPClient in run.py. I found that to be quite fragile for something that is non-essential to the working of Insights.

• Constructing a MetricsHTTPClient will fail (with a mysteriously error message) when there is no /etc/rhsm/rhsm,.conf file, or if that file does not contain the expected keys. I think uploads should just be skipped if the MetricsHTTPClient can't figure out where to upload to.

• Actual upload errors are only ignored when they are OSErrors. We get SSLErrors in our test suite because the client does not honor the insecure setting in rhsm.conf. I think any error should be allowed.