Merge ~adam-collard/maas:django-deprecation into maas:master

[Adam Collard]

Remove deprecated (unused) context argument from fields.

To see the DeprecationWarning run

PYTHONWARNINGS=module:::django.db.models.sql.compiler: bin/test.region src/maasserver/tests/test_fields.py

[MAAS Lander (maas-lander)]

UNIT TESTS
-b django-deprecation lp:~adam-collard/maas/+git/maas into -b master lp:~maas-committers/maas

STATUS: SUCCESS
COMMIT: 9bd91871d51b0a28e2af61bcc4b82ebd1fa511d7

review: Approve

[Alberto Donato (ack)]

+1

review: Approve

diff --git a/src/maasserver/fields.py b/src/maasserver/fields.py
index 5b37f27..fd94b24 100644
--- a/src/maasserver/fields.py
+++ b/src/maasserver/fields.py
@@ -160,7 +160,7 @@ class MACAddressField(Field):
     def to_python(self, value):
         return MAC(value)
 
-    def from_db_value(self, value, expression, connection, context):
+    def from_db_value(self, value, expression, connection):
         return MAC(value)
 
     def get_prep_value(self, value):
@@ -305,7 +305,7 @@ class JSONObjectField(Field):
         else:
             return None
 
-    def from_db_value(self, value, expression, connection, context):
+    def from_db_value(self, value, expression, connection):
         return self.to_python(value)
 
     def get_db_prep_value(self, value, connection=None, prepared=False):
@@ -530,7 +530,7 @@ class CIDRField(Field):
             return None
         return self.parse_cidr(value)
 
-    def from_db_value(self, value, expression, connection, context):
+    def from_db_value(self, value, expression, connection):
         if value is None:
             return value
         return self.parse_cidr(value)