services: Add ‘virtual-build-machine’ service.

* gnu/services/virtualization.scm (<virtual-build-machine>): New record type.
(%build-vm-ssh-port, %build-vm-secrets-port, %x86-64-intel-cpu-models):
New variables.
(qemu-cpu-model-for-date, virtual-build-machine-ssh-port)
(virtual-build-machine-secrets-port): New procedures.
(%minimal-vm-syslog-config, %virtual-build-machine-operating-system):
New variables.
(virtual-build-machine-default-image):
(virtual-build-machine-account-name)
(virtual-build-machine-accounts)
(build-vm-shepherd-services)
(initialize-build-vm-substitutes)
(build-vm-activation)
(virtual-build-machine-offloading-ssh-key)
(virtual-build-machine-activation)
(virtual-build-machine-secret-root)
(check-vm-availability)
(build-vm-guix-extension): New procedures.
(initialize-hurd-vm-substitutes): Remove.
(hurd-vm-activation): Rewrite in terms of ‘build-vm-activation’.
* gnu/system/vm.scm (linux-image-startup-command): New procedure.
(operating-system-for-image): Export.
* gnu/tests/virtualization.scm (run-command-over-ssh): New procedure,
extracted from…
(run-childhurd-test): … here.
[test]: Adjust accordingly.
(%build-vm-os): New variable.
(run-build-vm-test): New procedure.
(%test-build-vm): New variable.
* doc/guix.texi (Virtualization Services)[Virtual Build Machines]: New
section.
(Build Environment Setup): Add cross-reference.

Change-Id: I0a47652a583062314020325aedb654f11cb2499c

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