This reverts our previous policy of cascading versions on all servicing updates.
This moves variables into the 'pinned' section, and points them to the latest
stable release (versions that were used at the time of the 2.1.2 release).
There was a race condition between the first poll and any other http request that was sent.
In particular, if you called StartAsync then StopAsync it was possible for the delete to happen before the poll started leading to 400 errors. This change fixes that by making the very first poll
return immediately so that the client can use that to determine if there was an error connecting.
BrennanConroy
Nate McMaster
David Fowler