Ensure "reconnect" instead of "poll" is appended to reconnect requests

- JS client

#1794
JS test to ensure "reconnect" is appended to reconnect requests
Ensure "reconnect" is appended to path on reconnect attempts

- .NET client

#1794
.NET test to ensure "reconnect" is appended to reconnect requests
Updated /reconnect test to use both persistent and hub connections
Merge branch 'release' into dev