Support for API Tokens when Basic Auth is not enabled.

[tamirshaul]

Current implementation is sending the API-Token as a Basic authorization password with the special username api_key:

?curl http://api_key:eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk@localhost:3000/api/org

When Basic Auth is not enabled, this method doesn't work resulting with this issue:

?curl http://api_key:eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk@localhost:3000/api/org
Bad Request: Not allowed.

Resolution:
Make API-Token authentication with the Authorization header, like this (from the docs):

GET http://your.grafana.com/api/dashboards/db/mydash HTTP/1.1
Accept: application/json
Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk

with curl:

?curl -H "Authorization: Bearer eyJrIjoiT0tTcG1pUlY2RnVKZTFVaDFsNFZXdE9ZWmNrMkZYbk" http://your.grafana.com/api/dashboards/db/mydash

[PatMis16]

@tamirshaul
I am happy to inform you, that the changes are merged in the main branch.

See: 978538c