cubicweb #1772126 easy logging control for cubicweb-ctl shell [open]

Currently, cubicweb-ctl shell logging is controlled by the instance configuration file. I would like a way of controlling this from the command line.

Proposal: add -D and -l command line options similar to cwctl start command:

  • -D enables logging to stdout instead of the log file from the configuration file
  • -l <level> enables overriding the logging level from the configuration file.
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