fix unicode handling in journal plugin

Instead of recording in the database the test name converted to str(),
which is expected to fail for non-ascii characters, let's record the
repr() of the test name so we don't have to handle the encoding here.

Reference: https://trello.com/c/SoFLGQVQSigned-off-by: NAmador Pahim <apahim@redhat.com>

avocado/plugins/journal.py

@@ -89,7 +89,7 @@ class JournalResult(ResultEvents):
             status = None
 
         self.journal_cursor.execute(sql,
-                                    (str(state['name']),
+                                    (repr(state['name']),
                                      datetime.datetime(1, 1, 1).now().isoformat(),
                                      action,
                                      status))