juju/juju — pull request #958 by alesstimec (2014-10-23 20:12:40+00:00)
Title: Bug #1384622 - juju set should give feeback that the value is already set

Added a check to the "juju set" command, which issues a warning to the user
if the value of the configuration option is already set to the desired value.

The check is done by retrieving the unit's configuration options via an
additional API call and comparing the user-defined value with the
existing configuration value.