tests/integration: Move of naming/snapshot clientv3 tests (and yaml reference)

path change in clientv3/yaml/config_test

git mv clientv3/naming/grpc_test.go         tests/integration/clientv3/grpc_test.go
git mv clientv3/snapshot/*_test.go          tests/integration/snapshot
git mv clientv3/{main_test.go,example_*.go} tests/integration/clientv3/examples/

clientv3/yaml/config_test.go

@@ -25,9 +25,9 @@ import (
 )
 
 var (
-	certPath       = "../../integration/fixtures/server.crt"
-	privateKeyPath = "../../integration/fixtures/server.key.insecure"
-	caPath         = "../../integration/fixtures/ca.crt"
+	certPath       = "../../tests/integration/fixtures/server.crt"
+	privateKeyPath = "../../tests/integration/fixtures/server.key.insecure"
+	caPath         = "../../tests/integration/fixtures/ca.crt"
 )
 
 func TestConfigFromFile(t *testing.T) {