[Wishlist] Add checks for volume services

[sudeephb]

There are not checks for the volume services as it is the case for the neutron and compute services. It might be very useful to have such feature added to the charm

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Imported from Launchpad using lp2gh.

• date created: 2019-10-23T15:23:33Z

• owner: npochet

• assignee: aluria

• the launchpad url

[sudeephb]

(by xavpaice) While there should be service checks inside the Cinder charm itself, it would be helpful to do the same service list check within this charm.

[sudeephb]

(by vultaire) Fix released and available in: cs:~llama-charmers-next/openstack-service-checks-8