title: Override property in application.groovy with external config in grails 3
body: <p>There is no <code>grails.config.locations</code> property in grails 3 anymore, now Grails 3 uses Spring's property source concept instead, but how can I achieve the same behavior in grails 3 as it was in previous versions? Suppose I want to override some property <code>property.to.be.overridden</code> in application.grovy file with my external configuration file. How can I do it?</p>