exercise.sh was using wrong variable to generate token
diff --git a/exercise.sh b/exercise.sh
index d9d4c0a..c791601 100755
--- a/exercise.sh
+++ b/exercise.sh
@@ -55,7 +55,7 @@
# Get a token for clients that don't support service catalog
# ==========================================================
-SERVICE_TOKEN=`curl -s -d "{\"auth\":{\"passwordCredentials\": {\"username\": \"$NOVA_PROJECT_ID\", \"password\": \"$NOVA_API_KEY\"}}}" -H "Content-type: application/json" http://$HOST:5000/v2.0/tokens | python -c "import sys; import json; tok = json.loads(sys.stdin.read()); print tok['access']['token']['id'];"`
+SERVICE_TOKEN=`curl -s -d "{\"auth\":{\"passwordCredentials\": {\"username\": \"$NOVA_USERNAME\", \"password\": \"$NOVA_API_KEY\"}}}" -H "Content-type: application/json" http://$HOST:5000/v2.0/tokens | python -c "import sys; import json; tok = json.loads(sys.stdin.read()); print tok['access']['token']['id'];"`
# Launching a server
# ==================