minor #1044 Don't log console errors in console output (chalasr)

This PR was merged into the 3.3-dev branch.

Discussion
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Don't log console errors in console output

Since symfony/symfony#21003, console errors are logged, and since the `console` channel is not ignored by the monolog console handler, the log is written to stderr.

IMHO it's useless since the ran command already write the message into, it's just having two traces for the same error, which doesn't make sense to me.

I propose to fix that.

__Before__
![before](http://image.prntscr.com/image/16a2773542ee4a0caeaf626b119d5c18.png)

__After__
![after](http://image.prntscr.com/image/facb6641ffdf4df5af90d203c6327fb5.png)

If one wants the trace, then one can run the command in verbose mode or look at its log file.

Commits
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2bf1249 Don't log console errors in console output

Author: fabpot

app/config/config_dev.yml

@@ -20,7 +20,7 @@ monolog:
             channels: [!event]
         console:
             type:   console
-            channels: [!event, !doctrine]
+            channels: [!event, !doctrine, !console]
         # uncomment to get logging in your browser
         # you may have to allow bigger header sizes in your Web server configuration
         #firephp: