Comment # 9 on bug 954117 from Martin Vidner

Comment 5:
> I failed to find out why:
> - made "Cleanup when deleting packages" and
>   "Allow vendor change" not persistent.

Basically, Gabi and Michael Andres discussed the flags and said we should not
store these two flags. And I was a bit too quick in simply implementing it
without asking for the rationale and reviewing it.

I think we should elaborate on this explanation from
https://bugzilla.novell.com/show_bug.cgi?id=948134#c9 and give an example of
the damage that we are trying to avoid:
"The reason is to prevent unintentional deletion of packages (or installation
from a different repository in case of vendor change).
The libzypp default of these options is 'false' and the comments in
/etc/zypp/zypp.conf warn that "CHANGING THE DEFAULT IS NOT RECOMMENDED" because
of the risk of damage the system."