Add test case for checking callback invocation

Add test case for checking callback invocation

- Issue:
There is no test case for checking whether the callbacks which are set
by manager is invoked.

- Solution:
The voice control framework provides manager API for sending pcm data as
recording data. Using this APIs, we can simulate the situation that the
user says something. Thus, we can make new test case in this situation.
And also, using app manager framework, we can make situation that the
engine is suddenly terminate.
Using these simulation, this patch creates new test cases for checking
whether the callback is invoked. Through this patch, developer can check
some callbacks are properly invoked in proper situation.

Change-Id: I42d4167c1d6dc33b67858e309264a542032f5f3e
Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>