Start-up settings and env overrides have no impact on startup duration/interval

[lenny-goodell]

Service's pass in a timer that has been initialized with constants for Duration=30s and interval=1s.

Bootstrap attempts to update the timer with values from '[Startup]' configuration or environment variables, but the update doesn't seem to work.

The Startup configuration is not useful as it is needed prior to loading the configuration. It will be removed as the values are always 0 when go-mod-bootstrap attempts to use them. The Startup env variables will be the only way to change the startup values from the default values.