code: public static Boolean getBoolean(final LdapEntry ctx, final String attribute) {
          return getBoolean(ctx, attribute, Boolean.FALSE);
      }
docs: Reads a Boolean value from the LdapEntry.
  
  @param ctx       the ldap entry
  @param attribute the attribute name
  @return {@code true} if the attribute's value matches (case-insensitive) {@code "true"}, otherwise false