This change adds the haproxy options if defined by the
charm class to enable HTTP checks to the HAProxy
configuration, instead of the default TCP connection
checks.
options.ssl check if the environment is using http or
https mode. We disable certificate verification because
we are only interested in the health of the service.
Fix for tox4 compability
Closes-Bug: #1880610
Change-Id: Ie091fdfe560b6a060f0c29c6b92a99f5e564eddf
1c9e662d78