[SPARK-18662][HOTFIX] Add new resource-managers directories to SparkLauncher.

These directories are added to the classpath of applications when testing or
using SPARK_PREPEND_CLASSES, otherwise updated classes are not seen. Also,
add the mesos directory which was missing.

Author: Marcelo Vanzin <vanzin@cloudera.com>

Closes #16202 from vanzin/SPARK-18662.

launcher/src/main/java/org/apache/spark/launcher/AbstractCommandBuilder.java

@@ -158,12 +158,13 @@ abstract class AbstractCommandBuilder {
         "launcher",
         "mllib",
         "repl",
+        "resource-managers/mesos",
+        "resource-managers/yarn",
         "sql/catalyst",
         "sql/core",
         "sql/hive",
         "sql/hive-thriftserver",
-        "streaming",
-        "yarn"
+        "streaming"
       );
       if (prependClasses) {
         if (!isTesting) {