login_account_provider.analyzePassword: return directly the messages

This is a change in the API, previously only "messages id" were
returned.To make it easier to reuse analyzePassword in other contexts,
we now return the message directly.

product/ERP5/interfaces/login_account_provider.py

@@ -63,8 +63,11 @@ class ILoginAccountProvider(Interface):
   def analyzePassword(password, **kw):
     """
     Analyze password validity.
-    Return status code indicating if password is acceptable and if not status code
-    for reason for not being a valid one (i.e. too short, not complex, etc ...)
+
+    Returns a list of Products.ERP5Type.Message.Message instances describing
+    the reason for this password not to be valid (too short, not complex).
+
+    If password is valid, the returned list is empty.
     """
 
   def isPasswordAlreadyUsed(password):

product/ERP5/mixin/login_account_provider.py

@@ -89,8 +89,11 @@ class LoginAccountProviderMixin:
   def analyzePassword(self, password, **kw):
     """
     Analyze password validity.
-    Return status code indicating if password is acceptable and if not status code
-    for reason for not being a valid one (i.e. too short, not complex, etc ...)
+
+    Returns a list of Products.ERP5Type.Message.Message instances describing
+    the reason for this password not to be valid (too short, not complex).
+
+    If password is valid, the returned list is empty.
     """
     method = self._getTypeBasedMethod('analyzePassword')
     return method(password, **kw)