Failure during cb.end()

[nklincoln]

Within caliper-local-client.js the await cb.end(); is on the wrong line ... it needs to occur before the context is released ...

Proposed fix is to use this snippet instead:

// Clean up
            await rateController.end();
            await cb.end();
            await this.blockchain.releaseContext(this.context);
            this.clearUpdateInter(txUpdateInter);