[JENKINS-16301] Need to create parent directory of fingerprint file too.

core/src/main/java/hudson/model/Fingerprint.java

@@ -867,6 +867,7 @@ public class Fingerprint implements ModelObject, Saveable {
 
     void save(File file) throws IOException {
         if (facets.isEmpty()) {
+            file.getParentFile().mkdirs();
             // JENKINS-16301: fast path for the common case.
             PrintWriter w = new PrintWriter(file, "UTF-8");
             try {

core/src/test/java/hudson/model/FingerprintTest.java

@@ -141,7 +141,7 @@ public class FingerprintTest {
         f.addWithoutSaving("some", 3);
         f.addWithoutSaving("some", 10);
         f.addWithoutSaving("other", 6);
-        File xml = tmp.newFile();
+        File xml = new File(new File(tmp.getRoot(), "dir"), "fp.xml");
         f.save(xml);
         Fingerprint f2 = Fingerprint.load(xml);
         assertEquals(f.toString(), f2.toString());