The new element controls the behavior of the repart/resize code
in the oem-repart dracut module. By default the repart/resize
happens on every reboot and therefore also allows for disk
geometry changes during the livetime of the machine. If the
element is set to false the repart/resize operation happens
only once and then never again. To check for this condition
a new profile environment variable kiwi_rootpartuuid which
holds the PARTUUID of the root partition has been added to
the disk builder.
This commit avoids requesting non installed dracut modules to the dracut
creation. It bumps a warning message if the module requested by KIWI is
not installed in the root-tree and ignores the request.
This allows the creation of images without including KIWI dracut modules
when the related runtime checks are disabled.
Fixes#1300
