Change SDK deploy Txid to hash

Modify the transaction id for a deployment transaction
to the chaincode hash. The Txid was being incorrectly
set to a generated UUID.

Fixes FAB-288

Change-Id: I69736e05e2240b79ae3bb5bf378abf519ebbf993
Signed-off-by: Anna D Derbakova <adderbak@us.ibm.com>

sdk/node/src/hfc.ts

@@ -1757,10 +1757,10 @@ export class TransactionContext extends events.EventEmitter {
                     tx.setPayload(chaincodeDeploymentSpec.toBuffer());
 
                     //
-                    // Set the transaction UUID
+                    // Set the transaction ID
                     //
 
-                    tx.setTxid(sdk_util.GenerateUUID());
+                    tx.setTxid(hash);
 
                     //
                     // Set the transaction timestamp