updates

Author: qingyang-hu

mongo/integration/mtest/mongotest.go

@@ -636,8 +636,7 @@ func (t *T) createTestClient() {
 		// default opts
 		clientOpts = options.Client().SetWriteConcern(MajorityWc).SetReadPreference(PrimaryRp)
 	} else {
-		opts := *t.clientOpts
-		clientOpts = &opts
+		clientOpts = options.MergeClientOptions(t.clientOpts)
 	}
 	// set ServerAPIOptions to latest version if required
 	if clientOpts.Deployment == nil && t.clientType != Mock && clientOpts.ServerAPIOptions == nil && testContext.requireAPIVersion {