Add environmental variables to test.conf

This commit adds environmental variables to .testr.conf to disable
testr capturing STDOUT and STDERR by default. So now STDOUT and
STDERR will print immediately by default when using testr. It also
adds a default 250 sec timeout for tests. If a test takes longer than
this it will fail.

Change-Id: I32d8b1a856f6e7932d16b1464553e9c25fbc3cfc
diff --git a/.testr.conf b/.testr.conf
index 9a72d29..510f4c9 100644
--- a/.testr.conf
+++ b/.testr.conf
@@ -1,5 +1,8 @@
 [DEFAULT]
-test_command=${PYTHON:-python} -m subunit.run discover -t ./ ./tempest $LISTOPT $IDOPTION
+test_command=OS_STDOUT_CAPTURE=${OS_STDOUT_CAPTURE:-1} \
+             OS_STDERR_CAPTURE=${OS_STDERR_CAPTURE:-1} \
+             OS_TEST_TIMEOUT=${OS_TEST_TIMEOUT:-250} \
+             ${PYTHON:-python} -m subunit.run discover -t ./ ./tempest $LISTOPT $IDOPTION
 test_id_option=--load-list $IDFILE
 test_list_option=--list
 group_regex=([^\.]*\.)*