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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.
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