[MAGETWO-53180] It's impossible to disable ScheduledImportExport module due to dependency

[piotrekkaminski]

Preconditions

1. Prior to installation, remove ScheduledImportExport module

Steps to reproduce

1. Launch setup wizard

Expected result

1. No module functionality is present in Stores > Config > ADVANCED > System: Scheduled Import/Export File History Cleaning
2. No System > Scheduled menu item

Actual result

1. There is no possibility to install Magento2 EE without this module:
   Unable to enable modules because of the following constraints:
   Cannot enable Magento_Enterprise because it depends on disabled modules:
   Magento_ScheduledImportExport: Magento_Enterprise->Magento_ScheduledImportExport

[dmanners]

The fix itself may not be perfect for a first time issue but the process of finding out why this dependency is in place would be perfect for someone taking on their first issue.