Re-arrange Dominion PaxExam to support both probe and server mode

[paouelle]

Description

PaxExam supports probe testing and server mode testing. In probe testing, the container is laid down and a probe bundle is injected which reloads the test class such that the driver (running externally) can control it to invoke test cases. In server mode, the container is only laid down and the test case would run externally inside the driver. The latter is more suitable for black box testing while the former is perfect for component testing.

Dominion current implements one driver which uses PaxExam probe runner. This enhancement request is to slit the driver in 2:

• a common PaxExam set of classes
• a driver supporting probing

To allow us to create a new driver which would support the server mode.

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