Add counter for proxy integration test to prevent endless loop(s)

In some development environments the josh-proxy integration tests end up in an endless loop.
The root cause is not yet identified. Therefore an additional counter have been
added, to make sure the developer gets a failing test as feedback, instead of
getting stuck in an endless loop for no obvious reason.

Author: Nicoretti

tests/proxy/setup_test_env.sh

@@ -29,7 +29,14 @@ ${TESTDIR}/../../target/debug/josh-proxy\
     > ${TESTTMP}/josh-proxy.out 2>&1 &
 echo $! > ${TESTTMP}/proxy_pid
 
+COUNTER=0
 until curl -s http://localhost:8002/
 do
     sleep 0.1
-done
+    COUNTER=$((COUNTER + 1))
+    if [ $COUNTER -ge 10 ];
+    then
+        >& echo "Starting josh proxy timed out"
+        exit 1
+    fi
+done