introduce functions
   xenFormatXMEmulator(virConfPtr conf,........);
   xenFormatXMCDROM(virConfPtr conf, .......);
   xenFormatXMOS(virConfPtr conf,........);
which formats OS and associated config instead
Signed-off-by: NKiarie Kahurani <davidkiarie4@gmail.com>
Signed-off-by: NJim Fehlig <jfehlig@suse.com>