added apis for planned maintenance mode #115
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In our context, we use probes to indicate environments. These environments are disposable. So when we want to delete and recreate one, we wanted a way to tell vigil that things were not going to be working as usual with the environment during this maintenance period. Specifically, we did not want to receive down and recovery alerts in slack. This pull request adds two apis that allow people to disable and enable notifications for downed probes.
We also added timestamps to logs in src/config/logger.rs. Let us know if this is undesired but it has been really useful for us.