fix(tests): use 127.0.0.1 instead of localhost

cmd/karma/tests/testscript/083_metrics.txt

@@ -134,5 +134,5 @@ level=info msg="Removing PID file" path=karma.pid
 -- test.sh --
 while [ ! -f karma.pid ]; do sleep 1 ; done
 sleep 5
-curl -s http://localhost:8083/metrics | grep -vE 'process_|go_info' | perl -pe "s/^([a-zA-Z].+)[ ]([0-9\.\-\+eE]+)$/\1/g" > curl.txt
+curl -s http://127.0.0.1:8083/metrics | grep -vE 'process_|go_info' | perl -pe "s/^([a-zA-Z].+)[ ]([0-9\.\-\+eE]+)$/\1/g" > curl.txt
 cat karma.pid | xargs kill

cmd/karma/tests/testscript/085_debug.txt

@@ -27,6 +27,6 @@ level=info msg="Removing PID file" path=karma.pid
 -- test.sh --
 while [ ! -f karma.pid ]; do sleep 1 ; done
 sleep 1
-curl -s -o heap.gz http://localhost:8085/debug/pprof/heap
+curl -s -o heap.gz http://127.0.0.1:8085/debug/pprof/heap
 cat karma.pid | xargs kill
 gzip -d heap.gz || exit 1

cmd/karma/tests/testscript/108_alert_history_proxy_url.txt

@@ -51,7 +51,7 @@ history:
   rewrite:
     - source: '(.*)'
       uri: '$1'
-      proxy_url: http://localhost:9108
+      proxy_url: http://127.0.0.1:9108
 -- test.sh --
 while [ ! -f karma.pid ]; do sleep 1 ; done
 sleep 5