[site:install] Incorrect error message when database can't be accessed

[ericmorand]

When the database informations don't allow to access the database, the command site:install returns the following error:

[ERROR] Drupal is already installed, try dropping your database executing database:drop or install executing site:install --force --no-interaction

To reproduce the issue, set an invalid user, database or password in the default database configuration and execute vendor/bin/drupal site:install --force --no-interaction.

The error message should explain that the database couldn't be accessed.

[enzolutions]

@ericmorand Solved with #4024 will be included in next release 1.9.0