Raising the number of retries with exponential backoff so in potential slower machines there's time enough.

Related to issue:
https://github.com/dotnet/eShopOnContainers/issues/97

src/Web/WebMVC/Services/Utilities/RetryWithExponentialBackoff.cs

@@ -21,7 +21,7 @@ namespace Microsoft.eShopOnContainers.WebMVC.Services
     {
         private readonly int maxRetries, delayMilliseconds, maxDelayMilliseconds;
 
-        public RetryWithExponentialBackoff(int maxRetries = 10, int delayMilliseconds = 200, int maxDelayMilliseconds = 2000)
+        public RetryWithExponentialBackoff(int maxRetries = 50, int delayMilliseconds = 200, int maxDelayMilliseconds = 2000)
         {
             this.maxRetries = maxRetries;
             this.delayMilliseconds = delayMilliseconds;