- bump version number

- bump version number
- check for bootmanager-* directories as well (automated build appends
  version strings to exported build directories)
- generate yum.conf on the fly
- solve the bootstrap problem by also including any just built packages
  in yum.conf
- retrieve yumgroups.xml from the configured boot server
- add /sbin and /usr/sbin to su programs, in case we're running under
  sudo and they're not in build's PATH