* Don't use a complex UnmarshalJSON for RunConfigTask and ExecutorTask but
introduce a Steps type as a slice of Step (where Step is an empty interface)
and declare an UnmarshalJSON method on the Step type.
Just a raw replace of "github.com/pkg/errors".
Next steps will improve errors (like remote errors, api errors, not exist errors
etc...) to leverage its functionalities
Also if they are logically part of the runservice the names runserviceExecutor
and runserviceScheduler are long and quite confusing for an external user
Simplify them separating both the code parts and updating the names:
runserviceScheduler -> runservice
runserviceExecutor -> executor
