fix error and update entityGenerator

[yanmakouf]

Questions	Answers
Description?	Fix error when 2 product suppliers have the same id with adding option to make a line unique with parameters. Also delete functions seems useless to make generate entities more efficient.
Type?	bug fix + improvement
BC breaks?	yes
Deprecations?	no
Fixed ticket?	Fixes #21
How to test?	See #21
Possible impacts?

[paulnoelcholot]

@matthieu-rolland,

I have tested this PR and I can't repproduice the issue. Can you check my comment on this issus please? https://github.com/PrestaShop/prestashop-shop-creator/issues/21

Thanks you !