Remove unused yes parameter in xe-backup-metadata

This parameter was added in 7f1d315, but the
changes to always use the new metadata VDIs with known UUIDs means it is no
longer required, so remove it.

Signed-off-by: Alex Brett <alex.brett@cloud.com>

Author: alexbrett

scripts/xe-backup-metadata

@@ -39,7 +39,6 @@ function usage {
     echo " -k: Number of older backups to preserve (default: ${history_kept})"
     echo " -n: Just try to find a backup VDI and stop the script after that"
     echo " -f  Force backup even when less than 10% free capacity is left on the backup VDI"
-    echo " -y: Assume non-interactive mode and yes to all questions"
     echo " -v: Verbose output"
     echo 
     echo
@@ -70,7 +69,6 @@ just_find_vdi=0
 fs_uninitialised=0
 usage_alert=90
 force_backup=0
-yes=0
 while getopts "yhvink:u:dcf" opt ; do
     case $opt in
     h) usage ;;
@@ -81,7 +79,6 @@ while getopts "yhvink:u:dcf" opt ; do
     d) leave_mounted=1 ;;
     n) just_find_vdi=1 ;;
     v) debug="" ;;
-    y) yes=1 ;;
     f) force_backup=1 ;;
     *) echo "Invalid option"; usage ;;
     esac