jp: jp asyncio port:

/!\ this commit is huge. Jp is temporarily not working with `dbus` bridge /!\

This patch implements the port of jp to asyncio, so it is now correctly using the bridge
asynchronously, and it can be used with bridges like `pb`. This also simplify the code,
notably for things which were previously implemented with many callbacks (like pagination
with RSM).

During the process, some behaviours have been modified/fixed, in jp and backends, check
diff for details.

sat/plugins/plugin_xep_0065.py

@@ -175,17 +175,8 @@ ProxyInfos = namedtuple("ProxyInfos", ["host", "jid", "port"])
 
 
 class Candidate(object):
-    def __init__(
-        self,
-        host,
-        port,
-        type_,
-        priority,
-        jid_,
-        id_=None,
-        priority_local=False,
-        factory=None,
-    ):
+    def __init__(self, host, port, type_, priority, jid_, id_=None, priority_local=False,
+                 factory=None,):
         """
         @param host(unicode): host IP or domain
         @param port(int): port
@@ -227,15 +218,6 @@ class Candidate(object):
         return self._priority
 
     def __str__(self):
-        # similar to __unicode__ but we don't show jid and we encode id
-        return "Candidate ({0.priority}): host={0.host} port={0.port} type={0.type}{id}".format(
-            self,
-            id=" id={}".format(self.id if self.id is not None else "").encode(
-                "utf-8", "ignore"
-            ),
-        )
-
-    def __unicode__(self):
         return "Candidate ({0.priority}): host={0.host} port={0.port} jid={0.jid} type={0.type}{id}".format(
             self, id=" id={}".format(self.id if self.id is not None else "")
         )