Make sure the default initrd_system is set to dracut
for the vmx image type and to kiwi if no initrd_system
is specified. This allows to simplify other code parts
as we can trust there is a value set
Updates all XML descriptions to latest schema version and
also includes adaptions to the test XML descriptions for
testing the new Xen guest and server setup
Some attributes needed to be changed in the test xmls. With this
commit all the description files are consistent with the new co-
occurrence constraints.
Get_users method has been updated in order to be able to append the
groups attribute when a user is defined in multiple <users> sections in
the description file. Appart from groups, all other user attributes
are ignored if the user was already processed when parsing the description
file.
Get_users_groups method has been also updated so it returns a list of
groups with unique values, keeping the description file order.
