Use OS common cli auth arguments.

Change-Id: I80c9e42abb7060622d82cffc83d0108654a36562
diff --git a/exercises/swift.sh b/exercises/swift.sh
index 3a57744..95443df 100755
--- a/exercises/swift.sh
+++ b/exercises/swift.sh
@@ -23,22 +23,18 @@
 # Testing Swift
 # =============
 
-# FIXME(chmou): when review https://review.openstack.org/#change,3712
-# is merged we would be able to use the common openstack options and
-# remove the trailing slash to v2.0 auth url.
-#
 # Check if we have to swift via keystone
-swift --auth-version 2 -A http://${HOST_IP}:5000/v2.0/ -U admin -K $ADMIN_PASSWORD stat
+swift stat
 
 # We start by creating a test container
-swift --auth-version 2 -A http://${HOST_IP}:5000/v2.0/ -U admin -K $ADMIN_PASSWORD post testcontainer
+swift post testcontainer
 
 # add some files into it.
-swift --auth-version 2 -A http://${HOST_IP}:5000/v2.0/ -U admin -K $ADMIN_PASSWORD upload testcontainer /etc/issue
+swift upload testcontainer /etc/issue
 
 # list them
-swift --auth-version 2 -A http://${HOST_IP}:5000/v2.0/ -U admin -K $ADMIN_PASSWORD list testcontainer
+swift list testcontainer
 
 # And we may want to delete them now that we have tested that
 # everything works.
-swift --auth-version 2 -A http://${HOST_IP}:5000/v2.0/ -U admin -K $ADMIN_PASSWORD delete testcontainer
+swift delete testcontainer