Fixed adding the member role to the created cvp.user

Without this step, cvp.user cannot log in to the Horizon and
cannot operate the OpenStack.

Change-Id: Ibb1428a6341ff38ac0d9fae21d7b2add522d37d3
diff --git a/scripts/prepare.sh b/scripts/prepare.sh
index bde9605..2521d7e 100644
--- a/scripts/prepare.sh
+++ b/scripts/prepare.sh
@@ -195,6 +195,7 @@
     echo user create --project ${project} --password ${password} ${user} >>${cmds}
     echo user create --project ${project} --password ${password} ${admin} >>${cmds}
     echo role add --user ${admin} --project ${project} admin >>${cmds}
+    echo role add --user ${user} --project ${project} member >>${cmds}
 }
 
 function _sg_all() {