Add unittest like output for testr-full in tox

This commit adds real time output similar to that when running with
nose so that it's possible to watch the status of the job when using
testr with tempest.

Change-Id: I7a65be714627692ad80b3640af0ee617fd4697a9
diff --git a/tools/pretty_tox.sh b/tools/pretty_tox.sh
new file mode 100755
index 0000000..a5a6076
--- /dev/null
+++ b/tools/pretty_tox.sh
@@ -0,0 +1,4 @@
+#!/bin/sh
+
+TESTRARGS=$1
+python setup.py testr --slowest --testr-args="--subunit $TESTRARGS" | subunit2pyunit