Fix symbolic reference class is not accessible

[tommaso-borgato]

[Description of the issue]

In WildflyImageOpenShiftProvisioner, we have a Java module system (JPMS) error.

The method references EnvVar::getName and EnvVar::getValue cause java.lang.invoke.MethodHandle (in java.base) to try to access
io.fabric8.kubernetes.api.model.EnvVar, which it can't due to module boundaries:

symbolic reference class is not accessible: class io.fabric8.kubernetes.api.model.EnvVar, from class java.lang.invoke.MethodHandle (module java.base)