This removes the need to manually specify the version in all but unusual
cases.
For most installs this will effectively flip the default from
v1 (deprecated) to v2 so conservative existing installs may want to
manually configure "lb-version = v1" before upgrading.
In OpenStack Mitaka, the name field for members was added as an optional
field but does not exist in Liberty. Therefore the current
implementation for lbaas v2 will not work in Liberty.
