Handle failure of openstack endpoint

Change 4f7bf6963a1e9ae03bc0ae9189874cba561ad62f introduced finding the
endpoint via "openstack endpoint show" only.  Previously that output
was piped through grep, etc. so it handled fell back to a blank
output when the endpoints were not available.

Ignore failures of this command so the blank output is matched

Change-Id: Iae2f09784ffa38efd2f858513bf284c84c32edac
diff --git a/tools/create_userrc.sh b/tools/create_userrc.sh
index a34ad28..5b1111a 100755
--- a/tools/create_userrc.sh
+++ b/tools/create_userrc.sh
@@ -126,12 +126,12 @@
 
 export -n SERVICE_TOKEN SERVICE_ENDPOINT OS_SERVICE_TOKEN OS_SERVICE_ENDPOINT
 
-EC2_URL=$(openstack endpoint show -f value -c publicurl ec2)
+EC2_URL=$(openstack endpoint show -f value -c publicurl ec2 || true)
 if [[ -z $EC2_URL ]]; then
     EC2_URL=http://localhost:8773/services/Cloud
 fi
 
-S3_URL=$(openstack endpoint show -f value -c publicurl s3)
+S3_URL=$(openstack endpoint show -f value -c publicurl s3 || true)
 if [[ -z $S3_URL ]]; then
     S3_URL=http://localhost:3333
 fi