TT#119459 allow NULL values for SQLServer IDENTITY columns

Change-Id: Ibd008280773d815eebe1d56e030cce8d1806e63e
(cherry picked from commit 84f58f02de)

lib/NGCP/BulkProcessor/SqlConnectors/SQLServerDB.pm

@@ -252,6 +252,8 @@ sub db_connect {
     if (length($transaction_isolation_level) > 0) {
         $self->db_do('SET TRANSACTION ISOLATION LEVEL ' . $transaction_isolation_level);
     }
+    $self->db_do('SET ANSI_WARNINGS ON');
+    $self->db_do('SET ANSI_NULLS ON');
 
     dbinfo($self,'connected',getlogger(__PACKAGE__));