scheduler: nix logging, refactor
scheduler: nix logging, refactor

simonjjones/atc,zachgersh/atc,zachgersh/atc,pivotal-devin-fallak/atc,zachgersh/atc,savaki/atc,savaki/atc,pivotal-devin-fallak/atc,savaki/atc,pivotal-devin-fallak/atc,utako/atc,utako/atc,zachgersh/atc,utako/atc,simonjjones/atc,simonjjones/atc