master.yaml base path should be configurable

[bartoszherba]

Base path of master.yaml is at the moment hardcoded in CtiDigital/Configurator/Model/Processor.php on 238
It should be configurable/injectable or provided as an option in command:run; this is because running command in test scope requires to create example master.xml in app/etc not in more appropriate place. This also means that it is not possible to create isolated test environment.