cephadm: adjust the ingress ha proxy health check interval

cephadm: adjust the ingress ha proxy health check interval

Currently health checker uses default value of 2s, it is send list
bucket request for every 2s. This seems to be frequent and need to
adjust properly. Hence introducing new setting health_check_interval in
the ingress spec for haproxy.

Signed-off-by: Jiffin Tony Thottan <thottanjiffin@gmail.com>
Apply suggestions from code review

Co-authored-by: Adam King <47704447+adk3798@users.noreply.github.com>
Signed-off-by: Jiffin Tony Thottan  <thottanjiffin@gmail.com>