This change adds functions and commands to add, delete, list, get and
update health checks of load balancers. Also added a method to get one
load balancer by name or uuid and methods to modify 'ip_port_mappings'
column in the load balancer.
Closes-Bug: 1964382
Change-Id: I3f8b63c64c7ac9c570dbd400c562fa97840429ca