Make log filenames configurable

[bugy]

At the moment all the log files have the same pattern: script-user-date.log
It should be possible to change the pattern and date format.

(The issue is based on comments: #89 (comment) and #89 (comment))

@csphoenix1, welcome as a watcher

[bugy]

Done.
Can be configured in conf.json file, example config:

  "logging": {
    "execution_date_format": "%y-%m-%d_%H-%M-%S",
    "execution_file": "$ID$DATE"
  }

Date format should be in python format: https://docs.python.org/3/library/datetime.html#strftime-and-strptime-behavior
File is a filename format with python templating https://docs.python.org/2.4/lib/node109.html
The following fields are supported:

• ID - execution id
• USERNAME - name from script-server Auth or Base 64 auth header
• HOSTNAME - hostname, resolved from IP
• IP - ip of the executing user
• DATE - start time of the execution (in the date_format format)
• AUDIT_NAME - main name of the executing user (one of username -> hostname -> ip)
• SCRIPT - name of executed script

[bugy]

Hi @csphoenix1, did you have a chance to try it? Is there anything else I could change/improve regarding log naming?

[csphoenix1]

I @bugy, I can't test it for this moment because I'm in holidays but it's seems to be really good :)
I'll try to test it soon.
Thank's for this feature!
Best regards,