The secret store configuration provider was trying to access Dapr
during the app startup. If the app started faster than Dapr, it would
get an error trying to access the secrets. This commit lets the
provider wait for the sidecar to come up before making any requests.
If the sidecar does not come up at all, we will still fail.
https://github.com/dapr/dotnet-sdk/issues/779
Signed-off-by: Hal Spang <halspang@microsoft.com>