Use unique names for eustore kernel/ramdisk images
Use unique names for eustore kernel/ramdisk images

Fixes TOOLS-387

vasiliykochergin/euca2ools,nagyistoce/euca2ools,nagyistoce/euca2ools,vasiliykochergin/euca2ools,gholms/euca2ools,jhajek/euca2ools,jhajek/euca2ools,gholms/euca2ools