Test: Stop publishing text_output

Publishing of text_output doesn't makes much sense as what it does is
basically just open `self.logfile` and writes the content into memory.
This was only used by `xunit` plugin and this plugin can simply open the
file and read it.
Signed-off-by: NLukáš Doktor <ldoktor@redhat.com>

avocado/core/test.py

@@ -233,7 +233,6 @@ class Test(unittest.TestCase):
 
         self.log.info('START %s', self.name)
 
-        self.text_output = None
         self.__status = None
         self.__fail_reason = None
         self.__fail_class = None
@@ -446,7 +445,7 @@ class Test(unittest.TestCase):
             self._update_time_elapsed()
         preserve_attr = ['basedir', 'debugdir', 'depsdir', 'fail_reason',
                          'logdir', 'logfile', 'name', 'resultsdir', 'srcdir',
-                         'status', 'text_output', 'time_elapsed',
+                         'status', 'time_elapsed',
                          'traceback', 'workdir', 'whiteboard', 'time_start',
                          'time_end', 'running', 'paused', 'paused_msg',
                          'fail_class', 'params', "timeout"]
@@ -707,8 +706,6 @@ class Test(unittest.TestCase):
             self._tag_end()
             self._report()
             self.log.info("")
-            with open(self.logfile, 'r') as log_file_obj:
-                self.text_output = log_file_obj.read()
             self._stop_logging()
 
     def _report(self):

avocado/plugins/xunit.py

@@ -61,7 +61,12 @@ class XUnitResult(Result):
         traceback = document.createCDATASection(traceback_content)
         element.appendChild(traceback)
         system_out = Element('system-out')
-        system_out_cdata_content = self._escape_cdata(test.get('text_output', self.UNKNOWN))
+        try:
+            with open(test.get("logfile"), "r") as logfile_obj:
+                text_output = logfile_obj.read()
+        except (TypeError, IOError):
+            text_output = self.UNKNOWN
+        system_out_cdata_content = self._escape_cdata(text_output)
         system_out_cdata = document.createCDATASection(system_out_cdata_content)
         system_out.appendChild(system_out_cdata)
         element.appendChild(system_out)