Ecommerce orders deadlock issue 1175

[giorello]

Ref. #1175

DB deadlock is being thrown when orders are getting placed; This could be caused because unnecessary db requests and posts.
In this PR we added:

• Exception Handle to avoid Order Rollback in case od a deadlock.
• Filter to avoid set as modified a product when it is already set as modified.
• Set as modified an order only if it is already created (It would be created with the eCommerce cronjob if it's not).

This changes would avoid the DB deadlocks.

[Santiagoebizmarts]

Looks like the test should be modified if exists or created.

[nahall]

Any update on if this is verified to work properly or if 1.1.21 will be released with it soon? We started having these deadlocks upon upgrading to 1.1.20 and I'm going to need to disable the extension soon if I can't make these deadlocks go away.