DBI connector: separate driver from database name

[mbartosch]

In the DBI proxy connector the location is currently the full DBI connect string, including the database driver. In certain circumstances (i. e. when referencing the database name via a connector ref) it may be desirable to separate driver and database name.

Current syntax:
class: Connector::Proxy::DBI
LOCATION: DBI::Oracle::foobar

Suggested syntax:
class: Connector::Proxy::DBI
LOCATION: foobar
driver: DBI::Oracle