YARN-5822. Log ContainerRuntime initialization error in LinuxContainerExecutor. Contributed by Sidharta Seethana.

hadoop-yarn-project/hadoop-yarn/hadoop-yarn-server/hadoop-yarn-server-nodemanager/src/main/java/org/apache/hadoop/yarn/server/nodemanager/LinuxContainerExecutor.java

@@ -270,6 +270,7 @@ public class LinuxContainerExecutor extends ContainerExecutor {
         this.linuxContainerRuntime = runtime;
       }
     } catch (ContainerExecutionException e) {
+      LOG.error("Failed to initialize linux container runtime(s)!", e);
       throw new IOException("Failed to initialize linux container runtime(s)!");
     }