Less intrusive bugfix

I am totally on board with making tune_in asynchronous but we'll have to
address it in syndic and proxy minions too. As well as the corresponding
managers. This change is a bit less intrusive but achieves the same
end result.

salt/minion.py

@@ -1152,7 +1152,7 @@ class MinionManager(MinionBase):
                     minion.setup_scheduler(before_connect=True)
                 if minion.opts.get("master_type", "str") != "disable":
                     yield minion.connect_master(failed=failed)
-                yield minion.tune_in(start=False)
+                minion.tune_in(start=False)
                 self.minions.append(minion)
                 break
             except SaltClientError as exc:
@@ -2481,7 +2481,7 @@ class Minion(MinionBase):
         log.trace("ret_val = %s", ret_val)  # pylint: disable=no-member
         return ret_val
 
-    async def _state_run(self):
+    def _state_run(self):
         """
         Execute a state run based on information set in the minion config file
         """
@@ -2506,7 +2506,7 @@ class Minion(MinionBase):
                 else:
                     data["fun"] = "state.highstate"
                     data["arg"] = []
-                await self._handle_decoded_payload(data)
+                self.io_loop.add_callback(self._handle_decoded_payload, data)
 
     def _refresh_grains_watcher(self, refresh_interval_in_minutes):
         """
@@ -3209,7 +3209,7 @@ class Minion(MinionBase):
         return True
 
     # Main Minion Tune In
-    async def tune_in(self, start=True):
+    def tune_in(self, start=True):
         """
         Lock onto the publisher. This is the main event loop for the minion
         :rtype : None
@@ -3236,7 +3236,7 @@ class Minion(MinionBase):
             salt.utils.win_functions.enable_ctrl_logoff_handler()
 
         # On first startup execute a state run if configured to do so
-        await self._state_run()
+        self._state_run()
 
         self.setup_beacons()
         self.setup_scheduler()