make sure to reuse created steps

Author: itai-codefresh

lib/logger.js

@@ -201,6 +201,7 @@ class Logger {
         let stepLogger = this.steps[stepName];
         if (!stepLogger) {
             stepLogger = this.taskLogger.create(stepName, undefined, undefined, runCreationLogic);
+            this.steps[stepName] = stepLogger;
             logger.info(`Created new step logger for container: ${containerId}`);
             try {
                 await stepLogger.restore(); // jshint ignore:line