Refactor update creation api

This merge request does the following:

• Raise DRF errors rather than returning response to take advantage of the DRF exception handling mechanism
• Create serialisers for PUT request to simplify the code
• Improve validation checks in several places
• Fixes several issues in DRF infrastructure uses
• Fixes JSON fields handling
• Remove routes that do no fully qualify objects
• Implement a custom DRF exception handler that will allow to log errors
• Improve testing
• Improve permission management

beat/web/reports/serializers.py

@@ -30,8 +30,9 @@ from rest_framework import serializers
 
 from .models import Report
 from ..common.models import Contribution
-from ..ui.templatetags.markup import restructuredtext
 from ..common.utils import validate_restructuredtext
+from ..common import fields as beat_fields
+from ..ui.templatetags.markup import restructuredtext
 
 import simplejson as json
 
@@ -189,7 +190,7 @@ class ReportCreationFailedException(Exception):
 
 
 class ReportCreationSerializer(serializers.ModelSerializer):
-    content = serializers.JSONField()
+    content = beat_fields.JSONField()
     experiments = serializers.ListField(child=serializers.CharField())
 
     class Meta: