Add NOT FIND_IN_SET sql consition

Author: mageprince

lib/internal/Magento/Framework/DB/Adapter/Pdo/Mysql.php

@@ -2854,6 +2854,7 @@ public function endSetup()
      * - array("gteq" => $greaterOrEqualValue)
      * - array("lteq" => $lessOrEqualValue)
      * - array("finset" => $valueInSet)
+     * - array("nfinset" => $valueNotInSet)
      * - array("regexp" => $regularExpression)
      * - array("seq" => $stringValue)
      * - array("sneq" => $stringValue)
@@ -2883,6 +2884,7 @@ public function prepareSqlCondition($fieldName, $condition)
             'gteq'          => "{{fieldName}} >= ?",
             'lteq'          => "{{fieldName}} <= ?",
             'finset'        => "FIND_IN_SET(?, {{fieldName}})",
+            'nfinset'       => "NOT FIND_IN_SET(?, {{fieldName}})",
             'regexp'        => "{{fieldName}} REGEXP ?",
             'from'          => "{{fieldName}} >= ?",
             'to'            => "{{fieldName}} <= ?",