Fixes a bug in the Jenkins pipeline

It comment the line introduced with the commit f0eb330

Signed-off-by: Francesco Messina <francescomessina92@hotmail.com>

Author: francescomessina

scripts/install.sh

@@ -140,14 +140,14 @@ echo "Install polycube"
 cd $DIR/..
 if [ "$INSTALL_CLEAN_POLYCUBE" == true ] ; then
   $SUDO rm -rf build
-else
+#else
   # The above commands are executed only in case of a manual install;
   #   Jenkins runs this script with "$INSTALL_CLEAN_POLYCUBE" = true
   # The above commands are useful in case you are re-running this
   #   script on an existing install, i.e., update source code and
   #   all the submodules
-  git pull
-  git submodule update --init --recursive
+  #git pull
+  #git submodule update --init --recursive
 fi
 
 mkdir -p build && cd build