Rollback of commit 3696355.

*** Reason for rollback ***

Totally broke Bazel tests (100% failures!).
Found by git bisect after running the update script.

*** Original change description ***

sandbox: We have to move all generated outputs, not just regular files.

Fix for a part of bug #397.

--
MOS_MIGRATED_REVID=102354724

src/main/java/com/google/devtools/build/lib/sandbox/NamespaceSandboxRunner.java

@@ -163,7 +163,9 @@ private void copyOutputs(Collection<? extends ActionInput> outputs) throws IOExc
       Path source = sandboxExecRoot.getRelative(output.getExecPathString());
       Path target = execRoot.getRelative(output.getExecPathString());
       FileSystemUtils.createDirectoryAndParents(target.getParentDirectory());
-      Files.move(source.getPathFile(), target.getPathFile());
+      if (source.isFile()) {
+        Files.move(new File(source.getPathString()), new File(target.getPathString()));
+      }
     }
   }