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.

--- a/sat/plugins/plugin_adhoc_dbus.py	Wed Sep 25 08:53:38 2019 +0200
+++ b/sat/plugins/plugin_adhoc_dbus.py	Wed Sep 25 08:56:41 2019 +0200
@@ -236,7 +236,7 @@
                 flags=flags,
             )
 
-        defer.returnValue((bus_name, methods))
+        defer.returnValue((str(bus_name), methods))
 
     def _addCommand(self, client, adhoc_name, bus_name, methods, allowed_jids=None,
                     allowed_groups=None, allowed_magics=None, forbidden_jids=None,