Add glance client

* python-glanceclient overrides the old client shipped with glance in /usr/local/bin
* start adding exercises

Change-Id: I460ed5749bca69425f23d328c0537c2ef91f84a4
diff --git a/exercises/client-env.sh b/exercises/client-env.sh
index af2c4c2..10871a6 100755
--- a/exercises/client-env.sh
+++ b/exercises/client-env.sh
@@ -107,7 +107,7 @@
         STATUS_GLANCE="Skipped"
     else
         echo -e "\nTest Glance"
-        if glance index; then
+        if glance image-list; then
             STATUS_GLANCE="Succeeded"
         else
             STATUS_GLANCE="Failed"