Merge pull request #3 from SUSE-Cloud/master

force deletion of pre-existing winpe dir
Set ramdisktftpblocksize to 8192
Merge pull request #4 from gabriel-samfira/master

Set ramdisktftpblocksize to 8192
avoid hardcoded admin-server IP

by querying the current DHCP server at install-time
and using this IP to connect to its samba share