consolidated a method for workaroundForBug906550(...)
added workaroundForBug906550(...) case "\\d+ subscriptions removed at
the server\\."
added blockedByBug-877590 - The tool you are using is attempting
to re-register using Red Hat Subscription Management technology.
added ProxyTests.ReposAttemptsUsingProxyServer_Test(...)
added ProxyTests.ReposAttemptsUsingProxyServerViaRhsmConfig_Test(...)