Migrate OVSDB from XML to annotation based blueprint

In order to significantly simplify the use of OVSDB in https://github.com/vorburger/opendaylight-simple, and potentially other non-OSGi standalone Java environments (e.g. https://lighty.io; technically unrelated to opendaylight-simple), the current XML based Blueprint declarations should be switched to annotation based.

This is documented on https://wiki.opendaylight.org/view/BestPractices/DI_Guidelines, and has already been successfully done so in a number of other ODL projects (including OpenFlowPlugin, genius, Neutron and others).

Look at the Gerrit Reviews on OPNFLWPLUG-1046 and https://git.opendaylight.org/gerrit/#/q/topic:simple-dist for inspiration how to do this.