lisa/tests: eas_behaviour: Make rtapp profile construction less obfuscated
Created by: valschneider
This is where it would've been nice to operate on an instance of a class, so that we could use e.g. self.{min,max}_cap_cpus[0], but we
have to live with classmethods (or
cls.get_{min,max}_cap_cpus(plat_info)[0], which is too wordy for me).