Move vcpe configuration properties out of vcpe bundle.

Some vcpe properties must be configurable. An OpenNaaS admin should be able to modify them with no need to stop OpenNaaS.

This patch makes properties configurable, by moving them into platform etc directory.
Properties files are now cfg files, which are read by Karaf ConfigurationAdmin, allowing hot changes in them.
Make ModelTest not depend on OSGi.
Merge branch 'develop' into feature/vcpe-usr-configurable-properties
Merge pull request #519 from isartcanyameres/feature/vcpe-usr-configurable-properties

Feature/vcpe usr configurable properties