[FAB-4112] Remove legacy code
[FAB-4112] Remove legacy code

Remove useless legacy code in file
core/chaincode/exectransaction.go

Change-Id: Ic8273d171fbed9ae1d43ba6f17bf72323eb03c6b
Signed-off-by: jiangyaoguo <8c679c019d35fb0b37a6b261b23cdd9ecfc0f31b@gmail.com>

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