Provides always the layer2 argument when activating a qeth device

[teclator]

Problem

There is a checkbox in the s390 qeth activation dialog in order to enable "layer2" support. When the checkbox is checked we add the layer2=1 argument to the activation call czhdev -e group_device_id, but in case of not checked we are using the auto-detection instead of giving the argument layer2=0 explicitly.

# chzdev qeth --help-attribute layer2
ATTRIBUTE layer2

  DESCRIPTION
    Control layer mode for a QETH device:
      0: Device works in layer 3 mode
      1: Device works in layer 2 mode
     -1: Driver attempts autodetection (read-only value)

  DEFAULT VALUE
    The default value is '-1'.

  ACCEPTED VALUES
    - Integers in the range -1 - 1

  NOTES
    - This attribute cannot be changed while the device is online

The auto-detection could be fine in z/VM but will not work on LPAR.

• https://bugzilla.suse.com/show_bug.cgi?id=1183639

Solution

Add always the argument layer2 with the option selected to the activation call.

Tests

• Adapted unit test
• Tested manually

y2network/s390_device_activator.rb(configure):80 Activating s390 device: 0.0.0700:0.0.0701:0.0.0702
lib/cheetah.rb(record_commands):160 Executing "/sbin/chzdev qeth 0.0.0700:0.0.0701:0.0.0702 -e layer2\=0".

[coveralls]

Coverage increased (+0.009%) to 79.58% when pulling bfd8bca on qeth_layer2_always into 0ac388a on master.

[yast-bot]

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