controller/client: Fix typo in error message

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
controller/client: ListFormations -> FormationList

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
controller/examples: ListFormations -> FormationList

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
controller/examples: Refactor loadConfigFromEnv

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>
controller/examples: Improve log line

Signed-off-by: Jesse Stuart <jesse@jessestuart.ca>