Mark as deprecated distance method
Mark as deprecated distance method

It was left as rudiment after `rally info` and not used in
our code base.

Change-Id: I14fb7462a663aed1698af2d0370f0cd9edb10cc0

openstack/rally,vganapath/rally,yeming233/rally,openstack/rally,gluke77/rally,yeming233/rally,gluke77/rally,gluke77/rally,vganapath/rally,openstack/rally,vganapath/rally,openstack/rally,gluke77/rally,vganapath/rally