CLOUDSTACK-10304: turn off apache2 server tokens and signature in systemvms (#2563)

* systemvm: turn off apache2 server tokens and signature

This turns off apache2 server version signature/token in headers.

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

* systemvm: remove invalid code as conf.d is not available now

Signed-off-by: Rohit Yadav <rohit.yadav@shapeblue.com>

Author: yadvr

systemvm/debian/etc/apache2/conf-enabled/security.conf

@@ -0,0 +1,3 @@
+ServerTokens Prod
+ServerSignature Off
+TraceEnable Off

systemvm/debian/opt/cloud/bin/setup/common.sh

@@ -496,9 +496,6 @@ clean_ipalias_config() {
 
 setup_apache2_common() {
   sed -i 's/^Include ports.conf.*/# CS: Done by Python CsApp config\n#Include ports.conf/g' /etc/apache2/apache2.conf
-  [ -f /etc/apache2/conf.d/security ] && sed -i -e "s/^ServerTokens .*/ServerTokens Prod/g" /etc/apache2/conf.d/security
-  [ -f /etc/apache2/conf.d/security ] && sed -i -e "s/^ServerSignature .*/ServerSignature Off/g" /etc/apache2/conf.d/security
-
   # Disable listing of http://SSVM-IP/icons folder for security issue. see article http://www.i-lateral.com/tutorials/disabling-the-icons-folder-on-an-ubuntu-web-server/
   [ -f /etc/apache2/mods-available/alias.conf ] && sed -i s/"Options Indexes MultiViews"/"Options -Indexes MultiViews"/ /etc/apache2/mods-available/alias.conf