Simplify BinTools setup for integration tests

Progress on #4608.

PiperOrigin-RevId: 185126689
diff --git a/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java b/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java
index d4c5cac..bd5adbf 100644
--- a/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java
+++ b/src/test/java/com/google/devtools/build/lib/standalone/StandaloneSpawnStrategyTest.java
@@ -145,7 +145,7 @@
                         LocalEnvProvider.UNMODIFIED))),
             ImmutableList.<ActionContextProvider>of());
 
-    executor.getExecRoot().createDirectory();
+    executor.getExecRoot().createDirectoryAndParents();
   }
 
   private Spawn createSpawn(String... arguments) {