Enabling an initial set of itests for the trunk code

[Raymond Feng <en...@gmail.com>]

Hi,

I have brought up the following itests with the current core set of modules 
in trunk. As part of the work, I converted the JUNIT3 test cases into JUNIT4 
style too with some cleanups.

itest-callback-api
itest-callback-basic
itest-callback-complex-type
itest-callback-id
itest-callback-multiple-wires
itest-callback-separatethread
itest-callback-set-callback
itest-callback-set-conversation
itest-component-type
itest-conversations
itest-exceptions
itest-interfaces
itest-operation-overloading
itest-properties
itest-recursive-multi-level
itest-references
itest-scopes
itest-services
itest-wires

Thanks,
Raymond