qemu-guest-agent: freeze-hook to ignore dpkg files as well

The hook already skips a set of rpm upgrade artifacts.
Do the same with such files that might be created by dpkg.

Fixes: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1484990

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
Message-Id: <1513160272-15921-1-git-send-email-christian.ehrhardt@canonical.com>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

scripts/qemu-guest-agent/fsfreeze-hook

@@ -13,7 +13,7 @@ FSFREEZE_D=$(dirname -- "$0")/fsfreeze-hook.d
 # Check whether file $1 is a backup or rpm-generated file and should be ignored
 is_ignored_file() {
     case "$1" in
-        *~ | *.bak | *.orig | *.rpmnew | *.rpmorig | *.rpmsave | *.sample)
+        *~ | *.bak | *.orig | *.rpmnew | *.rpmorig | *.rpmsave | *.sample | *.dpkg-old | *.dpkg-new | *.dpkg-tmp | *.dpkg-dist | *.dpkg-bak | *.dpkg-backup | *.dpkg-remove)
             return 0 ;;
     esac
     return 1