help: |

    Create a KVM/LibVirt virtual machine during Morph's deployment.

    Parameters:

    * location: a custom URL scheme of the form `kvm+ssh://HOST/GUEST/PATH`,
      where:
        * HOST is the name of the host on which KVM/LibVirt is running
        * GUEST is the name of the guest VM on that host
        * PATH is the path to the disk image that should be created,
          on that host. For example,
          `kvm+ssh://alice@192.168.122.1/testsys/home/alice/testys.img` where
            * `alice@192.168.122.1` is the target host as given to ssh,
              **from within the development host** (which may be
              different from the target host's normal address);
            * `testsys` is the name of the new guest VM';
            * `/home/alice/testys.img` is the pathname of the disk image files
              on the target host.
    * HOSTNAME: the hostname of the **guest** VM within the network into which
      it is being deployed
    * DISK_SIZE: the size of the VM's primary virtual hard disk
    * RAM_SIZE: The amount of RAM that the virtual machine should allocate for
      itself from the host.
    * VCPUS: the number of virtual CPUs for the VM
    * INITRAMFS_PATH: the location of an initramfs for the bootloader to tell
      Linux to use, rather than booting the rootfs directly.