Added: --insert-ignore option (mysqldump)

Quote from i-MSCP Github (1.6.x)

Code

1. Added: --insert-ignore option (mysqldump)
2. Fixed: We need also support distribution default SQL server
3. Updated: preseeding template file
4. CS fixes +++

Source: https://github.com/i-MSCP/imsc…1a01ee77d6357b9ae5559694c