No success message after first-time sync

[chrisjohnson]

https://github.com/covermymeds/azure-key-vault-agent/blob/master/worker/worker.go#L43-L74

When the workers start up, the run Process() once, and if you don't see any errors you will know they were successful, but it can be confusing if you're looking at the logs expecting to see Successfully fetched resource(s), will try next in...

Right after this initial Process() we should log Successfully fetched resource(s), will try next in