Handle process better in Host

The method to check if a command exists asks for the help
of this command now (instead of checking if the command name
is in the output of rabbitmqctl). This way we just have
to check the exit code (0 if the command exists).

We also use a timeout to wait for the end of the process.

A test hangs on the CI environment, these changes try to
fix this.

(cherry picked from commit 6b2251f)

Author: acogoluegnes

src/test/java/com/rabbitmq/tools/Host.java

@@ -1,4 +1,4 @@
-// Copyright (c) 2007-2020 VMware, Inc. or its affiliates.  All rights reserved.
+// Copyright (c) 2007-2022 VMware, Inc. or its affiliates.  All rights reserved.
 //
 // This software, the RabbitMQ Java client library, is triple-licensed under the
 // Mozilla Public License 2.0 ("MPL"), the GNU General Public License version 2
@@ -28,12 +28,17 @@
 import com.rabbitmq.client.ConnectionFactory;
 import com.rabbitmq.client.impl.NetworkConnection;
 import com.rabbitmq.client.test.TestUtils;
+import java.util.concurrent.TimeUnit;
 import java.util.function.Predicate;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
 
 public class Host {
 
+    private static final Logger LOGGER = LoggerFactory.getLogger(Host.class);
+
     private static final String DOCKER_PREFIX = "DOCKER:";
     private static final Pattern CONNECTION_NAME_PATTERN = Pattern.compile("\"connection_name\",\"(?<name>[a-zA-Z0-9\\-]+)?\"");
 
@@ -78,7 +83,14 @@ private static int waitForExitValue(Process pr) {
     public static Process executeCommandIgnoringErrors(String command) throws IOException
     {
         Process pr = executeCommandProcess(command);
-        waitForExitValue(pr);
+        boolean exited = false;
+        try {
+            exited = pr.waitFor(30, TimeUnit.SECONDS);
+        } catch (InterruptedException e) {
+        }
+        if (!exited) {
+            LOGGER.warn("Command '{}' did not finish in 30 seconds", command);
+        }
         return pr;
     }
 
@@ -101,9 +113,9 @@ private static Process executeCommandProcess(String command) throws IOException
     }
 
     public static boolean isRabbitMqCtlCommandAvailable(String command) throws IOException {
-        Process process = rabbitmqctlIgnoreErrors("");
-        String stderr = capture(process.getErrorStream());
-        return stderr.contains(command);
+        Process process = rabbitmqctlIgnoreErrors(command + " --help");
+        int exitValue = process.exitValue();
+        return exitValue == 0;
     }
 
     public static Process rabbitmqctl(String command) throws IOException {