Create new proxy handle when connection is rejected

Create new proxy handle when connection is rejected

TIDL proxy does not need to try connect repeatedly. And also, if connection is failed by timeout,
app needs to create new proxy handle.

Thus, this patch makes flag variable to check whether connect function is called. Using this flag,
app calls connect function once. And also this patch creates new handle when on_rejected callback
is called to retry connection.

Change-Id: I8a7c26f825e95276e257e77451ffacc7a6722af5
Signed-off-by: Suyeon Hwang <stom.hwang@samsung.com>