Test: add reef to squid upgrade test

[sabaini]

Description

Add upgrade test

Type of change

Please delete options that are not relevant.

• CleanCode (Code refactor, test updates, does not introduce functional changes)

How Has This Been Tested?

NOTE: All functional changes should accompany corresponding tests (unit tests, functional tests etc).

Please describe the addition/modification of tests done to verify this change. Please also list any relevant details for your test configuration.

Contributor's Checklist

Please check that you have:

• self-reviewed the code in this PR.
• added code comments, particularly in hard-to-understand areas.
• updated the user documentation with corresponding changes.
• added tests to verify effectiveness of this change.

[lmlg]

Does it make sense to check that the osd-release is now properly set (and thus no warnings appear on a call to ceph status) ?

[lmlg]

Does it make sense to check that the osd-release is now properly set (and thus no warnings appear on a call to ceph status) ?

Disregard, this has been merged in a separate PR.

[lmlg]

lgtm, great stuff.