frontends: use new EXIT_BACKEND_NOT_FOUND exit code:

- new EXIT_BACKEND_NOT_FOUND (5) is used when frontend can't find backend with the bridge.
  It differs from EXIT_BRIDGE_ERROR (3) which is used when something went wrong when
  connecting to backend.
- use this exit code in quick app and in jp

sat/core/constants.py

@@ -381,6 +381,7 @@ class Const(object):
     EXIT_BAD_ARG = 2  # arguments given by user are bad
     EXIT_BRIDGE_ERROR = 3  # can't connect to bridge
     EXIT_BRIDGE_ERRBACK = 4  # something went wrong when calling a bridge method
+    EXIT_BACKEND_NOT_FOUND = 5  # can't find backend with this bride
     EXIT_NOT_FOUND = 16  # an item required by a command was not found
     EXIT_DATA_ERROR = 17  # data needed for a command is invalid
     EXIT_MISSING_FEATURE = 18  # a needed plugin or feature is not available

sat_frontends/jp/base.py

@@ -649,11 +649,13 @@ class LiberviaCli:
         except Exception as e:
             if isinstance(e, exceptions.BridgeExceptionNoService):
                 print((_("Can't connect to SàT backend, are you sure it's launched ?")))
+                self.quit(C.EXIT_BACKEND_NOT_FOUND, raise_exc=False)
             elif isinstance(e, exceptions.BridgeInitError):
                 print((_("Can't init bridge")))
+                self.quit(C.EXIT_BRIDGE_ERROR, raise_exc=False)
             else:
                 print((_(f"Error while initialising bridge: {e}")))
-            self.quit(C.EXIT_BRIDGE_ERROR, raise_exc=False)
+                self.quit(C.EXIT_BRIDGE_ERROR, raise_exc=False)
             return
         self.version = await self.bridge.getVersion()
         self._bridgeConnected()

sat_frontends/quick_frontend/quick_app.py

@@ -368,10 +368,10 @@ class QuickApp(object):
     def _bridgeEb(self, failure):
         if isinstance(failure, exceptions.BridgeExceptionNoService):
             print((_("Can't connect to SàT backend, are you sure it's launched ?")))
-            sys.exit(1)
+            sys.exit(C.EXIT_BACKEND_NOT_FOUND)
         elif isinstance(failure, exceptions.BridgeInitError):
             print((_("Can't init bridge")))
-            sys.exit(1)
+            sys.exit(C.EXIT_BRIDGE_ERROR)
         else:
             print((_("Error while initialising bridge: {}".format(failure))))