add systemd analyze commands to logdog output

[webern]

These commands can be helpful when trying to figure out a slow boot. Maybe we should add them to the information that logdog provides:

apiclient exec admin sheltie systemd-analyze blame
apiclient exec admin sheltie systemd-analyze critical-chain multi-user.target
apiclient exec admin sheltie systemd-analyze critical-chain configured.target
apiclient exec admin sheltie systemd-analyze critical-chain preconfigured.target