Update cheatsheets

tldr/openstack-image

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# openstack image
+
+> OpenStack Image service, aka OpenStack Glance, allows users to upload and discover data assets meant to be used with other services.
+> More information: <https://docs.openstack.org/python-openstackclient/latest/cli/command-objects/image-v2.html>.
+
+- List available images:
+
+`openstack image list {{--private|--shared|--all}}`
+
+- Display image details:
+
+`openstack image show --human-readable {{image_id}}`
+
+- Create/upload an image:
+
+`openstack image create --file {{path/to/file}} {{--private|--shared|--all}} {{image_name}}`
+
+- Delete image(s):
+
+`openstack image delete {{image_id1 image_id2 ...}}`
+
+- Save an image locally:
+
+`openstack image save --file {{filename}} {{image_id}}`