Fix ObjectDisposedException issue which was occurring in netcore1.0 and netcore1.1
Updated test cases related to backupserver AseException/AseError stuff, turns out that Errors[0] needs to be the most severe error, so altered that stuff slightly.
My OS was running out of ports to run tests with, so I've switched more of the test cases over to using a Pooled connection string to hopefully alleviate this.
Relates to issue #75
ObjectDisposedExceptionissue which was occurring innetcore1.0andnetcore1.1AseException/AseErrorstuff, turns out that Errors[0] needs to be the most severe error, so altered that stuff slightly.