test added for Mq invocation queue

Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>
minor improvement on Mq invocation queue tests

Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>
async executor registered to spring context

Signed-off-by: Laszlo Hornyak <laszlo.hornyak@gmail.com>