Fix Multi-Tenant Approach

Features

• It's now possible to register multiple strategies with the same scheme keycloak-jwt

Changes

• name is a new unique strategy-related option.
• apiKey.url not longer accepts placeholders
• The option setup changed. All plugin-related options are used as defaults for [strategy-related options][strategy-options].
• Even though every strategy-related option can also set via the plugin options, apiKey can only be set once in the plugin options.

In case of multiple registered strategies for this scheme:

• Use at least a different name option in each strategy.
• server.kjwt.validate requires name as second argument

Attention

• Needs a custom scheme when multiple strategies are used on single routes. More information: hapijs/hapi#3444 (comment)

Notes
Fixes #21, leverages #20 and solves #19