Updated the authentication configuration to support credentials

[Nyholm]

This PR fixes #42

// config.yml
httplug:
    plugins:
        authentication:
            my_basic:
                type: 'basic'
                username: 'foo'
                password: 'bar'
            my_wsse:
                type: 'wsse'
                username: 'foo'
                password: 'bar'
            my_brearer:
                type: 'bearer'
                token: 'foo'

    clients:
        acme:
            factory: 'httplug.factory.guzzle6'
            plugins: ['httplug.plugin.authentication.my_wsse']

This PR will break BC because change of the configuration in httplug.plugins.authentication.

[dbu]

we could go all fancy with custom validation to have the right required parameters based on the type. but we don't need that now.

i wonder if we should add type service that accepts a scalarNode authentication_service to keep supporting custom authentication services?

[Nyholm]

i wonder if we should add type service that accepts a scalarNode authentication_service to keep supporting custom authentication services?

Sure!

[sagikazarmark]

Not sure. People can still set up authentication plugins, can't they?

[Nyholm]

If we add type service then you could use the authentication plugin just as before. It just require you to do a minor config change.

Before:

// config.yml
httplug:
    plugins:
        authentication:
             authentication: 'my_authentication_service'
    clients:
        my_client:
            factory: 'httplug.factory.guzzle6'
            plugins: ['httplug.plugin.authentication']

After:

// config.yml
httplug:
    plugins:
        authentication:
            acme:
                type: 'service'
                service: 'my_authentication_service'
    clients:
        my_client:
            factory: 'httplug.factory.guzzle6'
            plugins: ['httplug.plugin.authentication.acme']

[dbu]

perfect, i think this configuration looks as simple and straightforward as it can be!

[Nyholm]

Thank you for the feedback. I've addressed your comments.

[dbu]

s/bearer/token/

[Nyholm]

I've merged PR #48 and I think this PR is ready for merge into master.

[sagikazarmark]

A squash would be a good idea first.

[Nyholm]

Of course, Sorry @sagikazarmark.
They are now squashed.

[dbu]

great job, thanks a lot!

[Nyholm]

Thank you for the input!