[FIXED] Stream/consumer limit reached edge conditions

[MauriceVanVeen]

Using MaxStreams and MaxConsumers you can limit the amount of streams, and the amount of consumers on a specific stream.

There were some edge conditions where stream/consumer creates would fail with a "limit reached" error which have been fixed in this PR:

• non-clustered create of a stream that already exists when at limit
• clustered create of a stream that already exists when at limit
• clustered create of a consumer that already exists when at limit

In above cases the accounting would think an additional stream/consumer would be added which would exceed the limit, even though this was not the case and the request should have been successful.

Signed-off-by: Maurice van Veen github@mauricevanveen.com

[derekcollison]

LGTM