Miner: provide full message on log output when simulateMsgGas fails

[rvagg]

There are 3 calls to simulateMsgGas, which does a GasEstimateMessageGas, two in storage/pipeline/commit_batch.go and one in storage/pipeline/precommit_batch.go. The two in commit_batch.go have a log.Errorf that provides the hex of the cbor encoded params. The one in precommit_batch.go skips the log.

Unfortunately, the params aren't quite enough to be able to re-execute the message to see the error. If the log is moved into simulateMsgGas then the full encoded message could be printed which could then be run with lotus-shed msg <hex>. The command itself could even be put into the log output to just make it a copy-paste exercise.