Add an option to specify tasks to run on start

[anjakefala]

Some tasks, like thermaldata, only run once per day, and can get disrupted by an ill-timed DIAS restart. DIAS restarts will lead to the promclient cache being erased, and a confusing cable loop delay graph in grafana.

We would like to add a boolean run_on_start task option to let us specify which DIAS to run upon a start-up. This will reduce the disruption of restarts.