Re-introduce sleep to lockfile creation wait.

org.hl7.fhir.utilities/src/test/java/org/hl7/fhir/utilities/npm/LockfileTestUtility.java

@@ -70,7 +70,7 @@ public class LockfileTestUtility {
       //  the file system immediately. It is unlikely to appear in production environments, but should it occur, it will
       //  result in a lock file being erroneously reported as not having an owning process, and will cause a package to
       //  fail to be loaded from that cache until the lock is cleaned up by cache initialization.
-      //Thread.sleep(100);
+      Thread.sleep(100);
 
   }