Add patch for better handling of thin pools and other LV types not supported

Fix multipath performance regression in 2.6, introduced by upstream PR #2299.

Rebase to upstream release 2.6 and drop unneded patches.
Add missing dependencies on dhcp-client (see #1926451), file
Patch documents to be compatible with asciidoc,
On POWER add bootlist & ofpathname to the list of required programs
upstream PR2665, add them to package

Backport PR2608:
Backport PR2625
Fix rsync error and option handling

Fix typo in default.conf
Modify the cron command to avoid an e-mail with error message after
Backport upstream code related to LUKS2 support
Changes for NetBackup (NBU) support, upstream PR2544

Update the Rubrik patch to include complete PR2445

Apply upstream PR2373: Skip Longhorn Engine replica devices

Apply upstream PR2346: Have '-iso-level 3' option also for ppc64le

Backport remaining Rubrik related patches.

Backport upstream PR #2249 to add support for Rubrik backup method.

Backport upstream PR #2293 to use grub-mkstandalone instead of
mkimage for UEFI (ISO image and GRUB_RESCUE image generation).

Apply upstream PR2122: add additional NBU library path to fix support for
Apply upstream PR2021: Be safe against empty docker_root_dir (issue 1989)
Apply upstream PR2223 and commit 36cf20e to avoid an empty string in the
Backport of Upstream fix for issue 2035: /run is not mounted in the rescue
Backport upstream PR 2218: avoid keeping build dir on errors
Apply upstream PR2173 - Cannot restore using Bacula method
Backport fix for upstream issue 2187 (disklayout.conf file contains

Apply upstream patch PR1993

Update fix for bz#1657725. Previous fix was not correct, bootlist was still

Apply upstream PR2065 (record permanent MAC address for team members)

Apply upstream PR2034 (multipath optimizations for lots of devices)