Make remote registry port and framework name configurable via system properties

[oliverlietz]

The fixed port range for the RMI Registry caused issues in the past:

• Make the port number from which test container starts searching for free ports configurable [PAXEXAM-181] #304
• RMI port range is not configurable for forked container [PAXEXAM-926] #1007

The ForkedFrameworkFactory should accept and use optional values for both properties (pax.swissbox.framework.rmi.port and pax.swissbox.framework.rmi.name):

    @Configuration
    public Option[] configuration() {
        final String port = Integer.toString(findFreePort());
        final String name = "pax-exam-remote-framework";
        return options(
            systemProperty(RemoteFramework.RMI_PORT_KEY).value(port),
            systemProperty(RemoteFramework.RMI_NAME_KEY).value(name),
            [...]
        );
    }

ForkedFrameworkFactory accepts a single port for flexibility and simplicity. Implementation of port range is up to the consumers.

[glimmerveen]

@oliverlietz thanks for picking this up. I have tested the current state as on v4.x, and it works as expected!