The PKISubsystem and PKIInstance classes used by the upgrade framework have been converted into a server management library. They have been enhanced to provide the following functionalities: * starting and stopping instances * enabling and disabling subsystems * checking instance and subsystem statuses The validate() invocation has been moved out of the constructors into the upgrade framework such that these objects can be created to represent subsystems and instances that do not exist yet. https://fedorahosted.org/pki/ticket/1183 -- Endi S. Dewata