Remove references to log translation functions
Remove references to log translation functions

No new implementers of this library should be using the log-oriented
marker functions, so we shouldn't be providing examples of them.
This change removes them from the sample integration module and
updates the usage examples to reflect the current best practices.

Change-Id: I0ae89cb3500821465438ee1f5572ab5e3573044c

openstack/oslo.i18n