openstack-{network, port, subnet}: add page (#17639)

Add pages openstack-network, openstack-port, openstack-subnet md.

Co-authored-by: Dylan <145150333+dmmqz@users.noreply.github.com>

pages/common/openstack-network.md

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+# openstack network
+
+> Manage OpenStack network resources.
+> More information: <https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/network.html>.
+
+- List all networks:
+
+`openstack network list`
+
+- Show details of a network:
+
+`openstack network show {{network_id_or_name}}`
+
+- Create a new network with a given name:
+
+`openstack network create {{network_name}}`
+
+- Delete a network:
+
+`openstack network delete {{network_id_or_name}}`
+
+- Enable a network:
+
+`openstack network set --enable {{network_id_or_name}}`
+
+- Disable a network:
+
+`openstack network set --disable {{network_id_or_name}}`

pages/common/openstack-port.md

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+# openstack port
+
+> Manage OpenStack network ports (virtual network interfaces).
+> More information: <https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/port.html>.
+
+- List all ports:
+
+`openstack port list`
+
+- Show detailed information about a specific port:
+
+`openstack port show {{port_id_or_name}}`
+
+- Create a port on a specific network:
+
+`openstack port create --network {{network_id_or_name}} {{port_name}}`
+
+- Create a port and assign it a fixed IP `192.168.1.50`:
+
+`openstack port create --network {{network_id}} --fixed-ip subnet={{subnet_id}},ip-address=192.168.1.50 {{port_name}}`
+
+- Delete a port:
+
+`openstack port delete {{port_id_or_name}}`

pages/common/openstack-subnet.md

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+# openstack subnet
+
+> Manage OpenStack subnets (IP address blocks within a network).
+> More information: <https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/subnet.html>.
+
+- List all subnets:
+
+`openstack subnet list`
+
+- Show details of a specific subnet:
+
+`openstack subnet show {{subnet_id_or_name}}`
+
+- List subnets associated with a network:
+
+`openstack subnet list --network {{network_id_or_name}}`
+
+- Create a subnet with subnet range `192.168.0.0/24` in a given network:
+
+`openstack subnet create --network {{network_id_or_name}} --subnet-range 192.168.0.0/24 {{subnet_name}}`
+
+- Delete a subnet:
+
+`openstack subnet delete {{subnet_id_or_name}}`
+
+- Update a subnet with DNS `8.8.8.8` and set a new name:
+
+`openstack subnet set --dns-nameserver 8.8.8.8 --name {{new_subnet_name}} {{subnet_id}}`