Revert "the *Value.data properties are no longer needed"

The mythicbeasts module (at least) is relying on them

This reverts commit 5d2ef02390.

octodns/record/__init__.py

@@ -339,10 +339,6 @@ class ValuesMixin(object):
     def _data(self):
         ret = super(ValuesMixin, self)._data()
         if len(self.values) > 1:
-            # we still look for a .data here for backwards compat reasons, any
-            # 3rd party value types may still rely on it (they should be
-            # transitioned, perhaps we should deprecate,  warn if it exists and
-            # remove it in 1.0
             values = [getattr(v, 'data', v) for v in self.values if v]
             if len(values) > 1:
                 ret['values'] = values
@@ -351,7 +347,6 @@ class ValuesMixin(object):
         elif len(self.values) == 1:
             v = self.values[0]
             if v:
-                # see getattr note above
                 ret['value'] = getattr(v, 'data', v)
 
         return ret
@@ -436,7 +431,6 @@ class ValueMixin(object):
     def _data(self):
         ret = super(ValueMixin, self)._data()
         if self.value:
-            # see getattr note above
             ret['value'] = getattr(self.value, 'data', self.value)
         return ret
 
@@ -947,6 +941,10 @@ class CaaValue(EqualityTupleMixin, dict):
     def value(self, value):
         self['value'] = value
 
+    @property
+    def data(self):
+        return self
+
     def _equality_tuple(self):
         return (self.flags, self.tag, self.value)
 
@@ -1198,6 +1196,10 @@ class LocValue(EqualityTupleMixin, dict):
     def precision_vert(self, value):
         self['precision_vert'] = value
 
+    @property
+    def data(self):
+        return self
+
     def __hash__(self):
         return hash(
             (
@@ -1319,6 +1321,10 @@ class MxValue(EqualityTupleMixin, dict):
     def exchange(self, value):
         self['exchange'] = value
 
+    @property
+    def data(self):
+        return self
+
     def __hash__(self):
         return hash((self.preference, self.exchange))
 
@@ -1436,6 +1442,10 @@ class NaptrValue(EqualityTupleMixin, dict):
     def replacement(self, value):
         self['replacement'] = value
 
+    @property
+    def data(self):
+        return self
+
     def __hash__(self):
         return hash(self.__repr__())
 
@@ -1603,6 +1613,10 @@ class SshfpValue(EqualityTupleMixin, dict):
     def fingerprint(self, value):
         self['fingerprint'] = value
 
+    @property
+    def data(self):
+        return self
+
     def __hash__(self):
         return hash(self.__repr__())
 
@@ -1762,6 +1776,10 @@ class SrvValue(EqualityTupleMixin, dict):
     def target(self, value):
         self['target'] = value
 
+    @property
+    def data(self):
+        return self
+
     def __hash__(self):
         return hash(self.__repr__())