Allow virt-customize to work on Ubuntu hosts as regular user

Ensure /boot/vmlinuz file can be read from regular users

Change-Id: I40628231b9d74e9786509675a97242df717910c8

devstack/plugin.sh

@@ -86,6 +86,15 @@ function configure_tobiko_glance {
 
     iniset_nonempty "${tobiko_conf_file}" glance image_dir \
         "${TOBIKO_GLANCE_IMAGE_DIR}"
+
+    ensure_boot_files_permissions
+}
+
+
+function ensure_boot_files_permissions {
+    if [ -f /boot/vmlinuz ]; then
+        sudo chmod ugo+r /boot/vmlinuz
+    fi
 }