virt-install, virt-sparsify: add page (#4333)

pages/common/virt-install.md

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+# virt-install
+
+> Create virtual machines with libvirt and begin OS installation.
+> More information: <https://virt-manager.org/>.
+
+- Create a virtual machine with 1 GiB RAM and 12 GiB storage and start Debian installation:
+
+`virt-install --memory {{1024}} --disk path={{path/to/image.qcow2}},size={{12}} --cdrom {{path/to/debian.iso}}`

pages/common/virt-sparsify.md

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+# virt-sparsify
+
+> Make virtual machine drive images thin-provisioned.
+> NOTE: Use only for offline machines to avoid data corruption.
+> Home page: <https://libguestfs.org/>.
+
+- Create a sparsified compressed image without snapshots from an unsparsified one:
+
+`virt-sparsify --compress {{path/to/image.qcow2}} {{path/to/image_new.qcow2}}`
+
+- Sparsify an image in-place:
+
+`virt-sparsify --in-place {{path/to/image.img}}`