[IMP] misc: move AUTOMATIC sentinel to misc.py, add new AUTO alias

This sentinel is relevant to all utils, not just `records.py`'s.
The AUTO alias is more convenient to remember/type in userspace.

Part-of: #304
Signed-off-by: Christophe Simonis (chs) <chs@odoo.com>

Author: Pirols

src/util/misc.py

@@ -60,6 +60,9 @@ def __repr__(self):
         return self.name
 
 
+AUTO = AUTOMATIC = Sentinel("AUTO")
+
+
 def _cached(func):
     sentinel = Sentinel("sentinel")
 

src/util/records.py

@@ -34,7 +34,7 @@
 from .inconsistencies import break_recursive_loops
 from .indirect_references import indirect_references
 from .inherit import direct_inherit_parents, for_each_inherit
-from .misc import Sentinel, chunks, parse_version, version_gte
+from .misc import AUTOMATIC, chunks, parse_version, version_gte
 from .orm import env, flush
 from .pg import (
     PGRegexp,
@@ -1006,9 +1006,6 @@ def ensure_xmlid_match_record(cr, xmlid, model, values):
     return new_res_id
 
 
-AUTOMATIC = Sentinel("AUTOMATIC")
-
-
 def update_record_from_xml(
     cr,
     xmlid,