[SPARK-15067][YARN] YARN executors are launched with fixed perm gen size

## What changes were proposed in this pull request?

Look for MaxPermSize arguments anywhere in an arg, to account for quoted args. See JIRA for discussion.

## How was this patch tested?

Jenkins tests

Author: Sean Owen <sowen@cloudera.com>

Closes #12985 from srowen/SPARK-15067.

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

@@ -325,7 +325,7 @@ class CommandBuilderUtils {
       return;
     }
     for (String arg : cmd) {
-      if (arg.startsWith("-XX:MaxPermSize=")) {
+      if (arg.contains("-XX:MaxPermSize=")) {
         return;
       }
     }

launcher/src/test/java/org/apache/spark/launcher/CommandBuilderUtilsSuite.java

@@ -99,12 +99,48 @@ public class CommandBuilderUtilsSuite {
     assertEquals(10, javaMajorVersion("10"));
   }
 
-  private void testOpt(String opts, List<String> expected) {
+  @Test
+  public void testAddPermGenSizeOpt() {
+    List<String> cmd = new ArrayList<>();
+
+    if (javaMajorVersion(System.getProperty("java.version")) > 7) {
+      // Does nothing in Java 8
+      addPermGenSizeOpt(cmd);
+      assertEquals(0, cmd.size());
+      cmd.clear();
+
+    } else {
+      addPermGenSizeOpt(cmd);
+      assertEquals(1, cmd.size());
+      assertTrue(cmd.get(0).startsWith("-XX:MaxPermSize="));
+      cmd.clear();
+
+      cmd.add("foo");
+      addPermGenSizeOpt(cmd);
+      assertEquals(2, cmd.size());
+      assertTrue(cmd.get(1).startsWith("-XX:MaxPermSize="));
+      cmd.clear();
+
+      cmd.add("-XX:MaxPermSize=512m");
+      addPermGenSizeOpt(cmd);
+      assertEquals(1, cmd.size());
+      assertEquals("-XX:MaxPermSize=512m", cmd.get(0));
+      cmd.clear();
+
+      cmd.add("'-XX:MaxPermSize=512m'");
+      addPermGenSizeOpt(cmd);
+      assertEquals(1, cmd.size());
+      assertEquals("'-XX:MaxPermSize=512m'", cmd.get(0));
+      cmd.clear();
+    }
+  }
+
+  private static void testOpt(String opts, List<String> expected) {
     assertEquals(String.format("test string failed to parse: [[ %s ]]", opts),
         expected, parseOptionString(opts));
   }
 
-  private void testInvalidOpt(String opts) {
+  private static void testInvalidOpt(String opts) {
     try {
       parseOptionString(opts);
       fail("Expected exception for invalid option string.");