public boolean isAllTarget() {
    return ALL_VERSIONS.equals(target) && ALL_VERSIONS.equals(targetStack);
  }
@return {@code true} if the upgrade targets any version or stack.  Both
{@link #target} and {@link #targetStack} must equal "*"
ambari-server/src/main/java/org/apache/ambari/server/stack/upgrade/UpgradePack.java