Add validation on bulkhandler import to Contacts

Saw a system where upgrading contact manager module failed due to invalid group types. I was able to reproduce by bulk importing the attached CSV. The import appears to fail with an error, but mysql entries with invalid type is still created:

MariaDB [asterisk]> select * from contactmanager_groups;
+----+-------+--------------------+----------+
| id | owner | name               | type     |
+----+-------+--------------------+----------+
|  1 |    -1 | User Manager Group | internal |
|  2 |    -1 | Alpha              | Interno  |
+----+-------+--------------------+----------+
2 rows in set (0.00 sec)