FAB-2747 only >= 500 should be considered errors

https://jira.hyperledger.org/browse/FAB-2747

Status code < 500 should be endorsed and can be potential
transactions. Note that all fabric errors will be 500 and
fabric system chaincodes return 0, 200 (ie, OK) or 500
(ie, ERROR) unambiguously.

Change-Id: Ia67500624ab29f4aa40125a77a5970a766c6d3d0
Signed-off-by: Srinivasan Muralidharan <muralisr@us.ibm.com>

core/endorser/endorser.go

@@ -137,7 +137,11 @@ func (e *Endorser) callChaincode(ctxt context.Context, chainID string, version s
 		return nil, nil, err
 	}
 
-	if res.Status != shim.OK {
+	//per doc anything < 500 can be sent as TX.
+	//fabric errors will always be >= 500 (ie, unambiguous errors )
+	//"lccc" will respond with status 200 or >=500 (ie, unambiguous OK or ERROR)
+	//This leaves all < 500 errors to user chaincodes
+	if res.Status >= shim.ERROR {
 		return nil, nil, fmt.Errorf(string(res.Message))
 	}