plugin XEP-0384: OMEMO trust policy: OMEMO trust policy can now be specified. For now there are 2 policies: - `manual`: each new device fingerprint must be explicitly trusted or not before the device can be used, and the message sent - `BTBV` (Blind Trust Before Verification): each new device fingerprint is automically trusted, until user manually trust or not a device, in which case the behaviour becomes the same as for `manual` for the entity. When using the Trust UI, user can put the entity back to blind trust if they wish. A message is send as feedback to user when a new device is/must be trusted, trying to explain clearly what's happening to the user. Devices which have been automically trusted are marked, so user can know which ones may cause security issue.

--- a/sat/core/sat_main.py	Fri Mar 27 09:55:16 2020 +0100
+++ b/sat/core/sat_main.py	Fri Mar 27 10:02:14 2020 +0100
@@ -882,7 +882,8 @@
     def _encryptionTrustUIGet(self, to_jid_s, namespace, profile_key):
         client = self.getClient(profile_key)
         to_jid = jid.JID(to_jid_s)
-        d = client.encryption.getTrustUI(to_jid, namespace=namespace or None)
+        d = defer.ensureDeferred(
+            client.encryption.getTrustUI(to_jid, namespace=namespace or None))
         d.addCallback(lambda xmlui: xmlui.toXml())
         return d