In Multirepository setup --siteaccess option used to change Siteaccess used for Command (and repository change by extension) is ignored when choosing Database connection for database existence check.

Steps to reproduce
1. Clean installation of eZ Platform 2.5.6
2. Multirepository setup with two Databases: db-1 and db-2.
3. Two backends Siteaccesses admin and admin2, using different cache.pool and repository. admin uses default repository (db-1), admin2 uses second repository (db-2).
4. Execute:

php bin/console ezplatform:install ezplatform-ee-clean --siteaccess=admin2

Result

Creating the database db-1 if it does not exist

Expected Result

Creating the database db-2 if it does not exist