Update Microsoft.Azure.KeyVault version to 2.2.1-preview

[JunTaoLuo]

This version is being verified by @pakrym now. Once verified and pushed to nuget we can update this version in Configuration.AzureKeyVault.

This will fix the issue Azure/azure-sdk-for-net#3003 and will unblock aspnet/MetaPackages#21 where we want to include this in the metapackage and runtime store.

[dnfclas]

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[muratg]

Should we also update the sample to have both JSON and KeyVault? (To prevent regressions with version caps in the future.)

[JunTaoLuo]

@pakrym found another problem where one of the transitive dependencies of M.Azure.KeyVault, Microsoft.Rest.ClientRuntime 2.3.6 also restricts the version of Newtonsoft.Json to less than 10. We may not be able to make this change.

@muratg We can do that to prevent this specific regression but do we then plan on doing this for every third party dependency everywhere in our code base?

[JunTaoLuo]

Merged in 5b4ff0e

[th3morg]

This should be reopened. The issue is happening again in the latest build.

[Eilon]

@th3morg can you log a new issue with details of what's happening? Please include any relevant version details, logs, error messages, stack traces, etc.