Allow any authentication method when using token auth

[kpdecker]

When using token auth, there should be an option to:

1. Use token used by the rest of the system vs. the custom token from nes
2. Apply normal hapi authentication to the upgrade

The current system requires an additional request that can be avoided by those who have everything they need already and also seems like it would loose authentication on reconnect. If able to specify custom auth headers from the client and auth strategy on the upgrade endpoint, both of these can be avoided when already using tokens elsewhere in the system.

[lock]

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