This patch adds 2 options into HealthMonitor CLI.
They are '--http-version' and '--domain-name'.
'--http-version' can be 1.0 or 1.1
'--domain-name' is a valid domain name string.
And the '--domain-name' option will be just avaliable when http version
is 1.1, otherwise the server side will raise ClientError.
Story: 2002160
Depends-On: https://review.openstack.org/#/c/626183/
Change-Id: If834d009599c20fd503f87c9f175275f6aa0c09b