improve test performance

tests/lab3/user_test.sh

@@ -19,7 +19,7 @@ fi
 echo ' Done.'
 
 echo -n 'Creating users...'
-for i in $(seq 9); do
+for i in $(seq 1); do
     curl -X POST -f -s \
         --data "{\"name\": \"hi$i\"}" \
         --header "Content-Type: application/json" \
@@ -49,7 +49,7 @@ echo " $DELETION_UUID."
 
 echo -n "Deleting user $DELETION_UUID..."
 curl -X DELETE -f -s \
-    http://127.0.0.1:12402/user/$DELETION_UUID > /dev/null
+    http://$HOST:12402/user/$DELETION_UUID > /dev/null
 
 if [ $? -ne 0 ]; then
     echo 'Exiting due to previous error'