Printf-style format strings should be used correctly

%n should be used in place of \n to produce the platform-specific line separator. The first one is evaluated at runtime, while \n is fixed at compile time. Refers to RSPEC-3457

• https://github.com/jboss-modules/jboss-modules/blob/2.0.0.Final/src/main/java/org/jboss/modules/Main.java#L268
• https://github.com/jboss-modules/jboss-modules/blob/2.0.0.Final/src/main/java/org/jboss/modules/Main.java#L281