Added logic to mute noisy env vars.

Author: AlexeyKuznetsov-DD

dd-smoke-tests/src/main/groovy/datadog/smoketest/ProcessManager.groovy

@@ -77,8 +77,10 @@ abstract class ProcessManager extends Specification {
     (0..<numberOfProcesses).each { idx ->
       ProcessBuilder processBuilder = createProcessBuilder(idx)
 
-      processBuilder.environment().put("JAVA_HOME", System.getProperty("java.home"))
-      processBuilder.environment().put("DD_API_KEY", apiKey())
+      Map<String, String> env = processBuilder.environment()
+      env.put("JAVA_HOME", System.getProperty("java.home"))
+      env.put("DD_API_KEY", apiKey())
+      muteNoisyEnvironmentVariables(env)
 
       processBuilder.redirectErrorStream(true)
 
@@ -191,6 +193,21 @@ abstract class ProcessManager extends Specification {
     || line.contains("Failed to handle exception in instrumentation")
   }
 
+  /**
+   * @return Set of noisy variables to remove.
+   */
+  protected Set<String> noisyEnvironmentVariables() {
+    return ['CI_COMMIT_MESSAGE'] as Set
+  }
+
+  /**
+   * Some variable can be printed in smoke application logs and result into false-positive test result.
+   * @param env environment variables to process.
+   */
+  void muteNoisyEnvironmentVariables(Map<String, String> env) {
+    noisyEnvironmentVariables().each { String envVar -> env.remove(envVar) }
+  }
+
   /**
    * Asserts that there are no errors printed by the application to the log.
    * This should usually be called after the process exits, otherwise it's not guaranteed that reading the log file will