allow for vmbuilder to change VM name and directory with the --hostname option

user@host:~/vm$ apt-cache policy
Display all 35203 possibilities? (y or n)
user@host:~/vm$ apt-cache policy ubuntu-vm-builder
ubuntu-vm-builder:
  Installed: (none)
  Candidate: 0.9-0ubuntu5
  Version table:
     0.9-0ubuntu5 0
        500 http://us.archive.ubuntu.com jaunty/universe Packages

Creating multiple virtual machines for the same hypervisor and OS is not allowed.
When creating a VM with "vmbuilder kvm ubuntu [options]" the VM will be placed in ubuntu-kvm directory. When a second VM is created with the same options, the following error is displayed

user@host:~$ sudo vmbuilder kvm ubuntu
2009-01-12 16:16:02,746 INFO Cleaning up
ubuntu-kvm already exists

the same error is thrown when the --hostname is provided

user@host:~$ sudo vmbuilder kvm ubuntu --hostname test
2009-01-12 16:16:02,746 INFO Cleaning up
ubuntu-kvm already exists

the only way to create a new VM is to run the vmbuilder command from a separate directory.
"vmbuilder kvm ubuntu --hostname test" should create the VM in directory "test-kvm" rather than checking for "ubuntu-kvm"

"vmbuilder kvm ubuntu --help" also mentions that the --hostname option will use the provided name as the VM name.

-hostname=HOSTNAME
                        Set NAME as the hostname of the guest. Default:
                        ubuntu. Also uses this name as the VM name.

Unless this is fixed in a developer trunk, I will be able to provide a patch in the near future.