[cdt-patch] Getting exit value.

["Alain Magloire" <alain@xxxxxxx>]

Put some code in to get the return value:

gdb usually returns:
 *stopped,reaso="exited",exit-code="04"

The exit-code is parse() in mi.core.event.MIInferiorExitEvent.java
and given when the UI ask for it(see mi.core.cdi.ExitInfo.java)

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