move chaincode events from TransactionResults into NonHashData

[muralisrini]

Description

With PR #1719 chaincode events need a new home. They should be moved directly into NonHashData.

This potentially will go away in New Consensus when we could move chaincode events directly into transaction (which HAS to happen if NonHashData goes).

Describe How to Reproduce

This needs to be done once PR #1719 is accepted. Without it chaincode events won't be sent out and https://github.com/hyperledger/fabric/tree/master/examples/events/block-listener will fail.