Add ServiceSpecificException to avoid system crash

- Netd's statusFromErrcode is return the ServiceSpecificException.
In S, the exception was ignored by NetworkManagementService.
But in T, the service is deprecated and netd binder call is used.
The exception is not handled and crashing the system.
In this case, NetworkStats is crashed and android system crashed also.


Change-Id: If906346fc3fccaec850e9d5cad166d7f29e4ca8e