Mark com.microsoft.azure.adal4j optional

[briandealwis]

I'm trying to use the Java client in an OSGi application, which is failing as the Java client library has a dependency on the com.microsoft.aad.adal4j package. This package cannot be found as com.microsoft.azure:adal4j dependency does not carry OSGi metadata.

But since this library is only required to use the Azure authenticator, we should mark this dependency as optional, which also marks the com.microsoft.aad.adal4j package dependency as optional too.

(This PR also fixes some stray tabs.)

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[briandealwis]

I signed it!

[brendandburns]

CNCF bot is still not happy. Did you use the same email as your github handle?

Otherwise, this looks fine to me.

[briandealwis]

Ah sorry, I hadn't linked my CNCF account to Github as a "social login". I think this should work now.

[brendandburns]

/lgtm
/approve

Thanks!

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: brendandburns, briandealwis

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