Backends: fix corner case error in public key retrieval #1068
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What this PR does / why we need it:
When connection to the database is sometimes unstable, it was possible that failure to retrieve the public key made
users unable to use APIs - as backend services crashed while checking authorization.
This seemed to be a problem with CQEx, so replace it with the Xandra driver.
This change applies to AppEngine, Realm Management and Pairing.
Which issue(s) this PR fixes:
Fixes #
Special notes for your reviewer:
Does this PR introduce a user-facing change?
Additional documentation e.g. usage docs, diagrams, etc.: