[LTP] LTP release preparations

[Petr Vorel]

Hi Cyril,

> What else should be considered for the release?

Fixes (worth to merge before)
* if-mtu-change.sh: Fix using functions
https://patchwork.ozlabs.org/project/ltp/patch/20220509094322.10959-1-pvorel@suse.cz/

* Fix constant redefinition
https://patchwork.ozlabs.org/project/ltp/list/?series=298174

I'd also like to post rebased
* shell: Fixes for disabled IPv6
https://patchwork.ozlabs.org/project/ltp/list/?series=284532
* shell: Add $TST_MOUNT_DEVICE support
https://patchwork.ozlabs.org/project/ltp/list/?series=291724

Could we decide whether this fix is worth of merging?
* Fix tst_search_driver for x86-64 modules
https://patchwork.ozlabs.org/project/ltp/list/?series=290523

2 additions to runtest/smoketest
* smoketest: Add macsec02.sh
https://patchwork.ozlabs.org/project/ltp/patch/20220310104457.764-1-pvorel@suse.cz/
* smoketest: Add df01.sh
https://patchwork.ozlabs.org/project/ltp/patch/20220322165042.20658-1-pvorel@suse.cz/

I guess we can postpone switching to bionic after the release
* ci: Ubuntu xenial -> bionic
https://patchwork.ozlabs.org/project/ltp/patch/20220316150429.2873-1-pvorel@suse.cz/

also remove rup and rusers can be decided after the release (although it's not
working on my VMs and I don't think it's worth to fix them)
* Remove RPC rup and rusers tests
https://patchwork.ozlabs.org/project/ltp/list/?series=297407

Kind regards,
Petr