resource: udev: also suggest ID_USB_INTERFACE_NUM for USBResource

[joergho]

Description
A USB serial device often provides multiple interfaces for the same
serial number. In these cases it is not possible to distinguish
the interfaces solely based on the serial number (ID_SERIAL_SHORT).
However, if additionally the interface number (ID_USB_INTERFACE_NUM)
is provided, it is possible to distinguish all interfaces without
the need of using the full device path (ID_PATH).

Example:

  (...)
  === suggested matches ===
  (...)
  USBSerialPort:
    match:
      ID_SERIAL_SHORT: ABCDEF00001
      ID_USB_INTERFACE_NUM: '00'
  (...)
  === suggested matches ===
  (...)
  USBSerial Port
  USBSerialPort:
    match:
      ID_SERIAL_SHORT: ABCDEF00001
      ID_USB_INTERFACE_NUM: '01'

Checklist

• Documentation for the feature
• Tests for the feature

• The arguments and description in doc/configuration.rst have been updated

• Add a section on how to use the feature to doc/usage.rst

• Add a section on how to use the feature to doc/development.rst

• PR has been tested

• Man pages have been regenerated

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 62.7%. Comparing base (be28ac1) to head (c7b634b).

Files	Patch %	Lines
labgrid/resource/udev.py	0.0%	8 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1334     +/-   ##
========================================
- Coverage    62.8%   62.7%   -0.1%     
========================================
  Files         163     163             
  Lines       12019   12025      +6     
========================================
  Hits         7550    7550             
- Misses       4469    4475      +6     

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[jluebbe]

Looks good, but needs a rebase.