Allow boolean settings to accept 'true', 't', 'yes', and 'y'

[dkliban]

The boolean settings that control the behavior of the multi process container should accept 'true', 't', 'yes', and 'y' for True.

PULP_HTTPS PULP_GUNICORN_RELOAD PULP_OTEL_ENABLED

[mdellweg]

I'm unsure what the naively expected condition should be. We could also add "1" or check for "set and not empty".

[mikedep333]

I'm unsure what the naively expected condition should be. We could also add "1" or check for "set and not empty".

we will check for "1" also.

We will not check for "set and not empty" because we do not want "false" to evaluate to "true".