fix: maven surefire plugin exception
fix: maven surefire plugin exception

Update maven surefire plugin configuration to fix exception raised when
compiling on recent JVM versions included in Ubuntu 18.10.

See https://stackoverflow.com/questions/50661648/spring-boot-fails-to-run-maven-surefire-plugin-classnotfoundexception-org-apache/50661649#50661649

aaguilera/equipstic-client-java,aaguilera/equipstic-client-java,UPC/equipstic-client-java,UPC/equipstic-client-java