Fixed: Integration tests on Mono 5.12 and 5.14

Mono 5.12 and 5.14 has a bug that means RestSharp can't handle non-200
responses.  Fix status api call so tests start and disable the tests
that use non-200 responses on these mono versions

src/NzbDrone.Integration.Test/HttpLogFixture.cs

@@ -11,6 +11,8 @@ namespace NzbDrone.Integration.Test
         [Test]
         public void should_log_on_error()
         {
+            IgnoreOnMonoVersions("5.12", "5.14");
+
             var config = HostConfig.Get(1);
             config.LogLevel = "Trace";
             HostConfig.Put(config);