Fix Canisters save inventory

[EsdrasVP]

This PR is able to:

• Fix the save inventory for Canisters to use multi instead of single

[EsdrasVP]

@miq-bot assign @agrare

[agrare]

@EsdrasVP you really need to test these end to end before putting these in.
When you have a PR to schema, core, and -lenovo you should be able to pass the new specs in your -lenovo repo before taking the core PR out of wip. Without a system to test this on it is more difficult for us to test these core PRs beyond just a visual once-over.

[EsdrasVP]

@agrare You're right, I'm creating some tests to assure this is working.

[rodneyhbrown7]

Request related to RFE https://bugzilla.redhat.com/show_bug.cgi?id=1629900

[agrare]

Same comment as the physical_disks one, this should just be :use_association

[EsdrasVP]

@agrare Also changed it.

[miq-bot]

This pull request is not mergeable. Please rebase and repush.

[agrare]

@EsdrasVP you need to rebase not merge upstream into your branch, do git pull --rebase=true upstream master instead

[miq-bot]

Checked commit EsdrasVP@2dc8d1c with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
1 file checked, 0 offenses detected
Everything looks fine. ⭐

[EsdrasVP]

@EsdrasVP you need to rebase not merge upstream into your branch, do git pull --rebase=true upstream master instead

@agrare Sorry for that, in a hurry I used the GitHub editor from my smartphone. Now I rebased here on my machine and I think everything is fine.