Health check on startup is expected to fail, change log level from warning to debug (#97)

core/src/main/java/io/javaoperatorsdk/jenvtest/process/ProcessReadinessChecker.java

@@ -112,7 +112,7 @@ private boolean ready(HttpClient client, HttpRequest request, String processName
       return response.statusCode() == 200;
     } catch (ConnectException e) {
       // still want to retry
-      log.warn("Cannot connect to the server", e);
+      log.debug("Cannot connect to the server", e);
       return false;
     } catch (IOException e) {
       throw new JenvtestException(e);