Removed useless local dev code

Author: Jérémy James Toussaint

src/main/java/com/iexec/worker/docker/CustomDockerClient.java

@@ -57,8 +57,6 @@ public CustomDockerClient() throws DockerCertificateException {
 
     public boolean pullImage(String chainTaskId, String image) {
         log.info("Image pull started [chainTaskId:{}, image:{}]", chainTaskId, image);
-        return true;
-        /*generateTeeSession,
         try {
             docker.pull(image);
         } catch (DockerException | InterruptedException e) {
@@ -69,7 +67,6 @@ public boolean pullImage(String chainTaskId, String image) {
 
         log.info("Image pull completed [chainTaskId:{}, image:{}]", chainTaskId, image);
         return true;
-        */
     }
 
     public boolean isImagePulled(String image) {