Change Default for KDUMP_AUTO_RESIZE to "no"

[shundhammer]

Bugzilla

https://bugzilla.suse.com/show_bug.cgi?id=1205816

Problem

The new KDUMP_AUTO_RESIZE causes problems with Xen virtualization: Both subsystems have a race condition against each other with memory allocation, and the Xen guest finally throws a kernel panic.

Cause

The deeper cause must be left to the kernel experts to discuss.

But one of the latest changes to yast-kdump switched that new feature on by default, and after a long discussion this turned out to be wrong:

https://github.com/openSUSE/kdump/blob/SLE-15-SP5/sysconfig.kdump.in#L57-L65

## Type:        yesno
## Default:     "no"
#
# When this option is set to yes, kdump tries to shrink the crash
# kernel reservation at boot.
#
# See also: kdump(6).
#
KDUMP_AUTO_RESIZE="no"

Fix

Set the default to "no". That is what this PR does.

Side Effect

The default crash kernel sizes now shrink dramatically.

[coveralls]

Coverage decreased (-0.7%) to 39.89% when pulling e08165f on huha-no-auto-resize into 06124bf on master.

[yast-bot]

✔️ Public Jenkins job #43 successfully finished
✔️ Created OBS submit request #1041196

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