Add company and employee as cache keys

issue3905
review8331002

company.py

@@ -7,6 +7,7 @@ from trytond.report import Report
 from trytond.pyson import Eval, If
 from trytond.transaction import Transaction
 from trytond.pool import Pool, PoolMeta
+from trytond.backend.database import CursorInterface
 
 try:
     import pytz
@@ -15,6 +16,8 @@ except ImportError:
     TIMEZONES = []
 TIMEZONES += [(None, '')]
 
+CursorInterface.cache_keys.update({'company', 'employee'})
+
 __all__ = ['Company', 'Employee', 'UserEmployee', 'User', 'Property',
     'Sequence', 'SequenceStrict', 'Date', 'CompanyConfigStart',
     'CompanyConfig', 'CompanyReport', 'LetterReport']