Allow startup if update attempt occurs

update_attempt will block waiting for the update to complete and the
update will shutdown the running skills process if an update is needed.

mycroft/skills/__main__.py

@@ -79,18 +79,20 @@ class DevicePrimer(object):
         """Internet dependent updates of various aspects of the device."""
         self._get_pairing_status()
         self._update_system_clock()
-        update_attempted = self._update_system()
-        if not update_attempted:
-            if self.time_skew_threshold_exceeded:
-                self._reboot()
+        if self.time_skew_threshold_exceeded:
+            self._reboot()
+        else:
+            self._update_system()
+            # Above will block during update process and kill this instance if
+            # new software is installed
+
+            if self.backend_down:
+                self._notify_backend_down()
             else:
-                if self.backend_down:
-                    self._notify_backend_down()
-                else:
-                    self._display_skill_loading_notification()
-                    self.bus.emit(Message('mycroft.internet.connected'))
-                    self._ensure_device_is_paired()
-                    self._update_device_attributes_on_backend()
+                self._display_skill_loading_notification()
+                self.bus.emit(Message('mycroft.internet.connected'))
+                self._ensure_device_is_paired()
+                self._update_device_attributes_on_backend()
 
     def _get_pairing_status(self):
         """Set an instance attribute indicating the device's pairing status"""
@@ -182,7 +184,6 @@ class DevicePrimer(object):
 
     def _update_system(self):
         """Emit an update event that will be handled by the admin service."""
-        update_attempted = False
         if not self.is_paired:
             LOG.info('Attempting system update...')
             self.bus.emit(Message('system.update'))
@@ -198,9 +199,6 @@ class DevicePrimer(object):
                     'system.update.complete',
                     1000
                 )
-                update_attempted = True
-
-        return update_attempted
 
     def _speak_dialog(self, dialog_id, wait=False):
         data = {'utterance': dialog.get(dialog_id)}