Move log statement in SessionRegistryImpl

[jbrokamp]

Moved a log statement in SessionRegistryImpl#registerNewSession after removeSessionInformation() is called for comprehensible output to the logger.

The log statements are now printed in the same order as the logic is executed. Before the change, this could be confusing when debugging an application, since it seemed that the registered session was immediately removed when only looking at the logs.

Before:

> Registering session 500B7FEE4F10F1CFD5C69561FB40C2EC, for principal examplePrincipal
> Removing session 500B7FEE4F10F1CFD5C69561FB40C2EC from principal's set of registered sessions
> Removing principal examplePrincipal from registry

After:

> Removing session E40C41AD72989210A64B1CA2436D7A54 from principal's set of registered sessions
> Removing principal examplePrincipal from registry
> Registering session E40C41AD72989210A64B1CA2436D7A54, for principal examplePrincipal

NB: I did not create a ticket for this.

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[rwinch]

Thanks for the PR @joos-edia! This is now merged into master