Deprecate SpfDnsLookupProcessor

CHANGELOG.md

@@ -17,6 +17,8 @@
   configs.
 * SpfRecord is formally deprecated with an warning and will become a
   ValidationError in 2.x
+* SpfDnsLookupProcessor is formally deprcated in favor of the version relocated
+  into https://github.com/octodns/octodns-spf and will be removed in 2.x
 
 #### Stuff
 

octodns/processor/spf.py

@@ -55,6 +55,9 @@ class SpfDnsLookupProcessor(BaseProcessor):
 
     def __init__(self, name):
         self.log.debug(f"SpfDnsLookupProcessor: {name}")
+        self.log.warning(
+            'SpfDnsLookupProcessor is DEPRECATED in favor of the version relocated into octodns-spf and will be removed in 2.0'
+        )
         super().__init__(name)
 
     def _get_spf_from_txt_values(