BaseMount/BaseCleanMount functions are deprecated

[FroggyFlox]

This issue is a follow-up of #49 .

In our config.sh, we currently use the BaseMount and BaseCleanMount. As reported in the kiwi build log, however, these functions are now deprecated as this is now taken care of by kiwi-ng itself. This deprecation happened in October 2020:
OSInside/kiwi#1597

The above methods are obsolete since kiwi handles these mount/umount processes as part of the core builder code.

It thus seems we can safely remove them from our config.sh, as has been done in Leap15.3 JeOS kiwi-template:
https://build.opensuse.org/package/view_file/openSUSE:Leap:15.3/kiwi-templates-JeOS/kiwi-templates-JeOS.changes?expand=1

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Wed Sep 2 10:00:36 UTC 2020 - Fabian Vogt [email protected]

• Drop call of baseCleanMount, not necessary

and

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Wed Jan 20 14:56:24 UTC 2021 - Fabian Vogt [email protected]

• Actually drop the call of baseCleanMount

[phillxnet]

@FroggyFlox Thanks for your continued diligence on this one. Nice for us to stick more closely with upstream Kiwi-ng changes here, and nice to be able to remove some more kipple.