tests: Add abort test

This calls os.abort() as the test action, testing avocado
ability of handle this case correctly.
Signed-off-by: NRuda Moura <rmoura@redhat.com>

tests/abort.py

+#!/usr/bin/python
+
+# This program is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+#
+# See LICENSE for more details.
+#
+# Copyright: Red Hat Inc. 2014
+# Author: Ruda Moura <rmoura@redhat.com>
+
+import os
+
+from avocado import test
+from avocado import job
+
+
+class abort(test.Test):
+
+    """
+    A test that just calls abort() (and abort).
+    """
+
+    def action(self):
+        os.abort()
+
+
+if __name__ == "__main__":
+    job.main()