core (memory/encryption): automatic start encryption if peer send encrypted message:

If peer sends encrypted message and we have no encryption activated, we automatically
start encryption to avoid sending plain text message when answering.

markAsEncrypted now needs the encryption algorithm namespace as mandatory argument.

sat/plugins/plugin_sec_otr.py

@@ -698,7 +698,7 @@ class OTR(object):
                     exceptions.CancelError("Cancelled by OTR")
                 )  # no message at all (no history, no signal)
 
-            client.encryption.markAsEncrypted(data)
+            client.encryption.markAsEncrypted(data, namespace=NS_OTR)
             trusted = otrctx.isTrusted()
 
             if trusted:

sat/plugins/plugin_xep_0384.py

@@ -1162,7 +1162,7 @@ class OMEMO:
         message_elt.children.remove(encrypted_elt)
         if plaintext:
             message_elt.addElement("body", content=plaintext)
-        post_treat.addCallback(client.encryption.markAsEncrypted)
+        post_treat.addCallback(client.encryption.markAsEncrypted, namespace=NS_OMEMO)
         defer.returnValue(True)
 
     def getJIDsForRoom(self, client, room_jid):