Try to reprepare when IPC I/O error occurs

Try to reprepare when IPC I/O error occurs

- Issue:
TTS API will be failed when the engine is terminated after the client
library already sends request.

- Solution:
Current client library does not handle the network connection failed
situation because almost those situations are covered by reprepare
logic. However, if the engine is terminated without handling client IPC
message, client library should returns error.
Thus, this patch adds new retry logic when network error occurs. Through
this logic, some of the issue case will be covered. However, if engine
has critical issue, then this logic also can cover those situations.

Change-Id: I07075e0139d058f9f9bc84026a00309bf1815066
Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>