Add several iOS network errors to retry list (#1544)

- NSURLErrorSecureConnectionFailed
 - NSURLErrorCannotFindHost
 - NSURLErrorDNSLookupFailed
 - NSURLErrorResourceUnavailable

NSURLErrorSecureConnectionFailed is visible as SSL handshake timeout
on slow network with high delays. The rest are more to be on a safe
side as their descriptions are not stating are further tries useless.

Relates-To: DATASDK-40

Signed-off-by: Rustam Gamidov <ext-rustam.gamidov@here.com>

Author: rustam-gamidov-here

olp-cpp-sdk-core/src/http/ios/OLPNetworkIOS.mm

@@ -92,7 +92,6 @@
 olp::http::ErrorCode ConvertNSURLErrorToNetworkErrorCode(NSInteger error_code) {
   switch (error_code) {
     case NSURLErrorUnsupportedURL:
-    case NSURLErrorCannotFindHost:
       return ErrorCode::INVALID_URL_ERROR;
     case NSURLErrorNotConnectedToInternet:
     case NSURLErrorDataNotAllowed:
@@ -101,10 +100,14 @@
       return ErrorCode::TIMEOUT_ERROR;
     case NSURLErrorNetworkConnectionLost:
     case NSURLErrorCannotConnectToHost:
+    case NSURLErrorSecureConnectionFailed:
+    case NSURLErrorCannotFindHost:
+    case NSURLErrorDNSLookupFailed:
+    case NSURLErrorResourceUnavailable:
       return ErrorCode::IO_ERROR;
     default:
       if (error_code >= NSURLErrorClientCertificateRequired &&
-          error_code <= NSURLErrorSecureConnectionFailed) {
+          error_code <= NSURLErrorServerCertificateHasBadDate) {
         return ErrorCode::AUTHORIZATION_ERROR;
       } else {
         return ErrorCode::UNKNOWN_ERROR;