Disable enforcement of username and password for database access

Current Situation

• JobScheduler branch 1.x makes use of SOSConnection classes for database access via JDBC.
• The SOSConnection classes force to specify a username and password. This is not applicable for all situations, for example when using Oracle Wallet® that allows to access a database without specifying credentials.

Desired Behavior

• The SOSConnection classes should no longer enforce the username and password to be specified.
• This applies to use of the classes for MySQL®, MariaDB®, Oracle®, PostgreSQL®
• This does not apply to SQL Server® that already can be accessed by SOSConnection for integrated security without specifying username and password