Fixes JENKINS-23274: remove log of script content

Avoids the script content appearing in the build output. Script execution is logged, but not the content of script.

src/main/java/org/jenkinsci/plugins/envinject/service/EnvInjectEnvVars.java

@@ -121,7 +121,7 @@ public int executeScript(boolean loadFromMaster,
            return new HashMap<String, String>();
        }

        logger.info(String.format("Evaluation the following Groovy script content: %n%s%n", scriptContent));
        logger.info("Evaluating the Groovy script content");

        Binding binding = new Binding();
        String jobName = envVars.get("JOB_NAME");