[Connection][WiFi][Non-ACR][Try to connect a Wi-Fi AP again]

[Connection][WiFi][Non-ACR][Try to connect a Wi-Fi AP again]

When the network is busy, it is possible that Wi-Fi connection is failed and an Exception is thrown from WiFiAP.ConnectAsync().
During the network setup, we need to try to connect to the Wi-Fi AP once
more.
Since the given preconditions are assumed to be correct, a Wi-Fi
connection failure is likely due to a temporary network issue.
If there are other issues, the retry will also fail.

Change-Id: I1e0f46a457e3946f99be49f896ddf5b90946ca9a
Signed-off-by: Cheoleun Moon <chleun.moon@samsung.com>