[FAB-15267] Refactor QueryExecutor mock in committer

Refactored QueryExecutor mock in core/committer/txvalidator
/v20 to generate from local interface.

Change-Id: I1a47054ffa1b0589929521f6a62ebcbd099d591a
Signed-off-by: Chongxin Luo <Chongxin.Luo@ibm.com>

Author: DereckLuo

core/committer/txvalidator/v20/mocks/query_executor.go

@@ -78,11 +78,18 @@ type Dispatcher interface {
 //go:generate mockery -dir . -name ChannelResources -case underscore -output mocks/
 //go:generate mockery -dir . -name LedgerResources -case underscore -output mocks/
 //go:generate mockery -dir . -name Dispatcher -case underscore -output mocks/
-//go:generate mockery -dir ../../../ledger/ -name QueryExecutor -case underscore -output mocks/
+
+//go:generate mockery -dir . -name QueryExecutor -case underscore -output mocks/
+
+// QueryExecutor is the local interface that used to generate mocks for foreign interface.
+type QueryExecutor interface {
+	ledger.QueryExecutor
+}
+
 //go:generate mockery -dir ../../../../common/policies/ -name ChannelPolicyManagerGetter -case underscore -output mocks/
 //go:generate mockery -dir plugindispatcher/ -name CollectionResources -case underscore -output mocks/
 
-// implementation of Validator interface, keeps
+// TxValidator is the implementation of Validator interface, keeps
 // reference to the ledger to enable tx simulation
 // and execution of plugins
 type TxValidator struct {