The EnableAutoConfig annotation should create a default Config instead of using a custom configBaseName

[fhussonnois]

AzkarraApplication should load the default configuration (i.e ConfigFactory.load()) when EnableAutoConfig is used with no resource base name. This is currently not the default behavior when AzkarraStreamsApplication is used because a config basename application is hard-coded.

This allows users to provide a different config source using system properties (e.g. from command line -Dconfig.file=path/to/config-file).