Handle HTTP error

[bdukes]

We're seeing a semi-consistent error during install, where retrying works. This is an adjustment to the error handling to allow this error to trigger the retry logic instead of failing immediately.

Error details

> Starting installation...
> Exception caught at: 9/11/2020 6:45:55 PM.
> System.Net.Http.HttpRequestException | An error occurred while sending the request.
>    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
>    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
>    at DeployClient.API.d__3.MoveNext() in C:\DNNDev\CantarusCore\PolyDeploy\DeployClient\API.cs:line 62
> --- End of stack trace from previous location where exception was thrown ---
>    at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
>    at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
>    at System.Runtime.CompilerServices.TaskAwaiter.ValidateEnd(Task task)
>    at DeployClient.Program.d__2.MoveNext() in C:\DNNDev\CantarusCore\PolyDeploy\DeployClient\Program.cs:line 148
> System.Net.WebException | Unable to connect to the remote server
>    at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)
>    at System.Net.Http.HttpClientHandler.GetResponseCallback(IAsyncResult ar)
> System.Net.Sockets.SocketException | A connection attempt failed because the connected party did not properly respond after a period of time, or established connection failed because connected host has failed to respond 12.147.61.210:443
>    at System.Net.Sockets.Socket.InternalEndConnect(IAsyncResult asyncResult)
>    at System.Net.Sockets.Socket.EndConnect(IAsyncResult asyncResult)
>    at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Socket s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state, IAsyncResult asyncResult, Exception& exception)

[bdukes]

I can confirm that integrating this change has resolved this issue for us.