Remove pimu.push_command() out of event loop

[hello-chintan]

Is there a reason for constantly sending a pimu.push_command() in the main event loop of stretch_driver? If it is just for turning the fan on at startup, could it be handled once outside the loop?

Doing so breaks the runstop service as the runstop trigger and reset methods are not followed by a push command. Have added the fix to this PR.

[hello-fazil]

@hello-chintan
We have seen the Pimu fan turn off by itself a few seconds after turning on the fan with a push command. Therefore as a patch, we push the command to turn on the fan every loop to keep the fan always running. But this should be a harmless push, as trigger syncs are not involved.

[hello-chintan]

@hello-fazil Gotcha! Thanks for the clarification.