caddyconfig: Implement retries into HTTPLoader (#5077)
caddyconfig: Implement retries into HTTPLoader (#5077)

* httploader: Add max_retries

* caddyconfig: dependency-free http config loading retries

* caddyconfig: support `retry_delay` in http loader

* httploader: Implement retries

* Apply suggestions from code review

Co-authored-by: Matt Holt <6e15340bc34d98c823445cca0475cc9127379d4b@users.noreply.github.com>

Co-authored-by: Matt Holt <6e15340bc34d98c823445cca0475cc9127379d4b@users.noreply.github.com>
l3dlp/caddy,l3dlp/caddy,l3dlp/caddy