Rename blender_id url to blender-id

This fixes a non-compliant to RFC 1178 exception raised by the Django implementation of Blender ID. The issue is debated here https://code.djangoproject.com/ticket/20264.

pillar/config.py

@@ -28,7 +28,7 @@ SECRET_KEY = ''
 AUTH_TOKEN_HMAC_KEY = b''
 
 # Authentication settings
-BLENDER_ID_ENDPOINT = 'http://blender_id:8000/'
+BLENDER_ID_ENDPOINT = 'http://blender-id:8000/'
 
 PILLAR_SERVER_ENDPOINT = 'http://pillar:5001/api/'
 
@@ -116,7 +116,7 @@ BLENDER_ID_USER_INFO_TOKEN = '-set-in-config-local-'
 #    'blender-id': {
 #        'id': 'CLOUD-OF-SNOWFLAKES-43',
 #        'secret': 'thesecret',
-#        'base_url': 'http://blender_id:8000/'
+#        'base_url': 'http://blender-id:8000/'
 #     }
 # }
 # OAuth providers are defined in pillar.auth.oauth

pillar/tests/config_testing.py

@@ -24,7 +24,7 @@ OAUTH_CREDENTIALS = {
     'blender-id': {
         'id': 'blender-id-app-id',
         'secret': 'blender-id–secret',
-        'base_url': 'http://blender_id:8000/'
+        'base_url': 'http://blender-id:8000/'
     },
     'facebook': {
         'id': 'fb-app-id',