disable log of user code /log in lighter pod

[julienlau]

As is, the default behavior is that the lighter pod logs too much !

It logs:

• the code submitted through a statement
• the console log of the job "Pi is roughly"

Would it be possible to disable it ?

[pdambrauskas]

I've created a pull request changing log level for statement code, and a way to change log level, it should be merged for our next release