Added load-balancer_member for the cvp.user

Without this role, the member cvp.user cannot create the
load balancers.

Related-PROD: PROD-37198
Change-Id: I6f93edee3dcc4bb52b2625158ed7d06e23f9b801
diff --git a/scripts/prepare.sh b/scripts/prepare.sh
index cc1aa28..f26e9b3 100644
--- a/scripts/prepare.sh
+++ b/scripts/prepare.sh
@@ -201,6 +201,7 @@
     echo role add --user ${admin} --project ${project} creator >>${cmds}
     echo role add --user ${user} --project ${project} member >>${cmds}
     echo role add --user ${user} --project ${project} creator >>${cmds}
+    echo role add --user ${user} --project ${project} load-balancer_member >>${cmds}
 
 }