Add possibility to log some functions into file

[phracek]

This allows container-workflow-tool to log some actions into a file specified by --output-file option. This option can help with automation.

Signed-off-by: Petr "Stone" Hracek phracek@redhat.com

[pkubatrh]

Since we are using Logger for most of the output, maybe it would be better to move to using Logger instead of the print functions you are touching and update Logger setup to be able to change the log output to a file.

WDYT @phracek

[phracek]

Thanks for your comment. It looks good, logger_file can be used for it, and output_file can be used for it. I will try to do it.

[phracek]

@pkubatrh As soon as parameter --output-file is specified then all logs for specific functions are written to the file. For now:

• utils listimages
• utils listupstream

[phracek]

I have merged by mistake :( Sorry.