Invocations to AbstractProcess.process() will be replaced by AbstractProcess.get()

AbstractProcess.process() method body is code generated and contains the KIE process definition used by the engine. 

Every time this method is invoked, a new process definifition (which is not mutable) is generated.

To prevent that a new AbstractProcess.get() method that only initializes the process definition once was added with another JIRA.

This Jira will make process() protected and replace its usage by the get() public one.