Continuously stream data from verbose jobs

In verbose unified job models (inventory updates, system jobs,
etc.), do not delay dispatch just because the encoded
event data is not part of the data written to the buffer.

This allows output from these commands to be submitted
to the callback queue as they are produced, instead
of waiting until the buffer is closed.

awx/main/tests/unit/utils/test_event_filter.py

@@ -5,7 +5,7 @@ from StringIO import StringIO
 
 from six.moves import xrange
 
-from awx.main.utils import OutputEventFilter
+from awx.main.utils import OutputEventFilter, OutputVerboseFilter
 
 MAX_WIDTH = 78
 EXAMPLE_UUID = '890773f5-fe6d-4091-8faf-bdc8021d65dd'
@@ -145,3 +145,55 @@ def test_large_stdout_blob():
     f = OutputEventFilter(_callback)
     for x in range(1024 * 10):
         f.write('x' * 1024)
+
+
+def test_verbose_line_buffering():
+    events = []
+
+    def _callback(event_data):
+        events.append(event_data)
+
+    f = OutputVerboseFilter(_callback)
+    f.write('one two\r\n\r\n')
+
+    assert len(events) == 2
+    assert events[0]['start_line'] == 0
+    assert events[0]['end_line'] == 1
+    assert events[0]['stdout'] == 'one two'
+
+    assert events[1]['start_line'] == 1
+    assert events[1]['end_line'] == 2
+    assert events[1]['stdout'] == ''
+
+    f.write('three')
+    assert len(events) == 2
+    f.write('\r\nfou')
+
+    # three is not pushed to buffer until its line completes
+    assert len(events) == 3
+    assert events[2]['start_line'] == 2
+    assert events[2]['end_line'] == 3
+    assert events[2]['stdout'] == 'three'
+
+    f.write('r\r')
+    f.write('\nfi')
+
+    assert events[3]['start_line'] == 3
+    assert events[3]['end_line'] == 4
+    assert events[3]['stdout'] == 'four'
+
+    f.write('ve')
+    f.write('\r\n')
+
+    assert len(events) == 5
+    assert events[4]['start_line'] == 4
+    assert events[4]['end_line'] == 5
+    assert events[4]['stdout'] == 'five'
+
+    f.close()
+
+    from pprint import pprint
+    pprint(events)
+    assert len(events) == 6
+
+    assert events[5]['event'] == 'EOF'