Allow some blockhound block methods

- Looks like some tests fails with redis
  as new lettuse driver, during connect phase,
  will block as there's a timeout which cause
  a block within netty internals(which a bit weird).
- Time of this commit block error came from
  https://github.com/netty/netty/blame/4.1/common/src/main/java/io/netty/util/HashedWheelTimer.java#L349

spring-statemachine-build-tests/src/test/java/org/springframework/statemachine/buildtests/StateMachineBlockHoundIntegration.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.statemachine.buildtests;
+
+import reactor.blockhound.BlockHound.Builder;
+import reactor.blockhound.integration.BlockHoundIntegration;
+
+public class StateMachineBlockHoundIntegration implements BlockHoundIntegration {
+
+	@Override
+	public void applyTo(Builder builder) {
+		// whitelisting some blocking calls in tests
+		builder
+			.allowBlockingCallsInside("java.util.concurrent.locks.AbstractQueuedSynchronizer", "parkAndCheckInterrupt");
+	}
+}

spring-statemachine-build-tests/src/test/resources/META-INF/services/reactor.blockhound.integration.BlockHoundIntegration

@@ -0,0 +1 @@
+org.springframework.statemachine.buildtests.StateMachineBlockHoundIntegration

spring-statemachine-data/redis/src/test/java/org/springframework/statemachine/data/redis/StateMachineBlockHoundIntegration.java

@@ -0,0 +1,29 @@
+/*
+ * Copyright 2020 the original author or authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.springframework.statemachine.data.redis;
+
+import reactor.blockhound.BlockHound.Builder;
+import reactor.blockhound.integration.BlockHoundIntegration;
+
+public class StateMachineBlockHoundIntegration implements BlockHoundIntegration {
+
+	@Override
+	public void applyTo(Builder builder) {
+		// whitelisting some blocking calls in tests
+		builder
+			.allowBlockingCallsInside("java.util.concurrent.locks.AbstractQueuedSynchronizer", "parkAndCheckInterrupt");
+	}
+}

spring-statemachine-data/redis/src/test/resources/META-INF/services/reactor.blockhound.integration.BlockHoundIntegration

@@ -0,0 +1 @@
+org.springframework.statemachine.data.redis.StateMachineBlockHoundIntegration