Some fixes I've found using REST client

[benjaminr-ps]

It seems that these files are generated, so this PR can be used as reference fixing the generator hopefully.

[davidstaheli]

Thanks very much for this, @benjaminr-ps! We'll get to it ASAP.

[AlexRukhlin]

We cannot modify generated files manually. However, recently we've re-generated them and I hope most of the issues have been resolved. However, LogicalOperations class still looks ugly. I'll investigate what I can do.

Thanks,
Alex

[AlexRukhlin]

The serialization of the LogicalOperations class's (as any other) members is defined by its declaration in the server REST API controllers. IMO, serialization rules are case insensitive and the ugle look of the current state of the LogicalOperations class shouldn't cause any issue for vso-httpclient-java. However, I agree that it would be nice if the server team improves this class definition on the server. I've notified the team responsible for the REST clients' generation about this request. Thank you.

Alex