haproxy: Enable http-ignore-probes and disable dontlognull.
haproxy: Enable http-ignore-probes and disable dontlognull.

HTTP Probing by the MS Edge browser leads to 408's being returned
which this browser then erroneously displays to the user. Disable
the option to work around this bug in Edge.

https://www.mail-archive.com/haproxy@formilux.org/msg19535.html
https://developer.microsoft.com/en-us/microsoft-edge/platform/issues/7553785/
CXT-18812

Also disable dontlognull so we can better monitor which responses
are sent to empty requests.

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