Update cheatsheets

tldr/openstack-subnet

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# 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}}`