avocado.job: Call throbber progress conditionally

Previously, the throbber update method was being called
unconditionally, making throbber progress to appear even
when human output was not enabled. Fix this by making
a proxy method that calls it only if there is a human
plugin enabled, in TestResultProxy.
Signed-off-by: NLucas Meneghel Rodrigues <lmr@redhat.com>

avocado/job.py

@@ -184,7 +184,7 @@ class TestRunner(object):
                     test_state = q.get(timeout=cycle_timeout)
                 except Queue.Empty:
                     if p.is_alive():
-                        self.job.output_manager.throbber_progress()
+                        self.job.result_proxy.throbber_progress()
                     else:
                         should_quit = True
 

avocado/result.py

@@ -38,6 +38,11 @@ class TestResultProxy(object):
             else:
                 return None
 
+    def throbber_progress(self):
+        for output_plugin in self.output_plugins:
+            if hasattr(output_plugin, 'throbber_progress'):
+                output_plugin.throbber_progress()
+
     def add_output_plugin(self, plugin):
         if not isinstance(plugin, TestResult):
             raise InvalidOutputPlugin("Object %s is not an instance of "
@@ -323,3 +328,6 @@ class HumanTestResult(TestResult):
         """
         TestResult.add_warn(self, state)
         self.stream.log_warn(state['time_elapsed'])
+
+    def throbber_progress(self):
+        self.stream.throbber_progress()