remove result output in succeded tasks

[danielmichalichyn]

Description

In this pull request I'm suggesting that we remove the result output when a task is succeded. If we need to print the result when a task is finished, we can do a console.info/.log from the task.
Printing the result from the celery.node package, can create issues if we have a huge result output, and when we run this application in a Docker the container logs get flooded with a lot of useless information.

• What kind of change does this PR introduce? (Bug fix, feature, docs update, ...)
  Removing the result variable from a console.info.

• What is the current behavior? (You can also link to an open issue here)
  Print all the result into the console of the application;

• What is the new behavior (if this is a feature change)?
  Print only conclusion information about the task;

[actumn]

Hi, @danielmichalichyn!
Always greatly appreciated this awesome PR!

But in this case, I'm not sure it is really required for us.
We should hear other user's voices.

[bitcranos]

Hi @actumn ,
I believe @danielmichalichyn is right. If the worker's function is handling personal sensitive information (ie: tax id, Social Security number etc...), you don't want to have them logged and potentially available for other teams/people to see (es: sys admin, ops team, etc...).
Maybe, instead of removing the result variable for all worker's functions, it can be handled with an optional parameter to add when a function is registered into a worker.