code: boolean isUsingSecurityDefaults() {
          Jenkins j = Jenkins.get();
          if (j.getSecurityRealm() instanceof HudsonPrivateSecurityRealm) {
              HudsonPrivateSecurityRealm securityRealm = (HudsonPrivateSecurityRealm)j.getSecurityRealm();
              try {
                  if(securityRealm.getAllUsers().size() == 1) {
                      HudsonPrivateSecurityRealm.Details details = securityRealm.loadUserByUsername(SetupWizard.initialSetupAdminUserName);
                      FilePath iapf = getInitialAdminPasswordFile();
                      if (iapf.exists()) {
                          if (details.isPasswordCorrect(iapf.readToString().trim())) {
                              return true;
                          }
                      }
                  }
              } catch(UsernameNotFoundException | IOException | InterruptedException e) {
                  return false; // Not initial security setup if no transitional admin user / password found
              }
          }
          return false;
      }
docs: /*package