do not notify Zimbra by default

ZimbraBuild/rpmconf/Install/postinstall.pm

@@ -53,7 +53,7 @@ sub configure {
 
 sub notifyZimbra {
   if (!defined ($main::options{c}) && 1) {
-    if (main::askYN("\nYou have the option of notifying Zimbra of your installation.\nThis helps us to track the uptake of the Zimbra Collaboration Server.\nThe only information that will be transmitted is:\n\tThe VERSION of zcs installed (${main::curVersion}_${main::platform})\n\tThe ADMIN EMAIL ADDRESS created ($main::config{CREATEADMIN})\n\nNotify Zimbra of your installation?", "Yes") eq "yes") {
+    if (main::askYN("\nYou have the option of notifying Zimbra of your installation.\nThis helps us to track the uptake of the Zimbra Collaboration Server.\nThe only information that will be transmitted is:\n\tThe VERSION of zcs installed (${main::curVersion}_${main::platform})\n\tThe ADMIN EMAIL ADDRESS created ($main::config{CREATEADMIN})\n\nNotify Zimbra of your installation?", "No") eq "yes") {
       if (open NOTIFY, "/opt/zimbra/libexec/zmnotifyinstall ${main::curVersion}_${main::platform} $main::config{CREATEADMIN} |") {
         while (<NOTIFY>) {
           main::progress ("$_");