Check if config is updated before restarting service

[mattpascoe]

In an effort to streamline restarts of the service we should add a diff operation just after the syntax check. Once the syntax is correct, simply test the current config with the timestamp for differences. If they are the same then simply exit. If they are different then proceed as usual.

In the long term having a check in the database to find if an update even needs to be started would help.