disable xtrabackup for now, aclocal is missing

slapos/instance.cfg

@@ -10,7 +10,7 @@ recipe = ${instance-recipe:name}
 dcrond_binary = ${dcron:location}/sbin/crond
 haproxy_binary = ${haproxy:location}/sbin/haproxy
 httpd_binary = ${apache:location}/bin/httpd
-innobackupex_binary = ${xtrabackup:location}/bin/innobackupex
+#innobackupex_binary = ${xtrabackup:location}/bin/innobackupex
 kumo_gateway_binary = ${kumo:location}/bin/kumo-gateway
 kumo_manager_binary = ${kumo:location}/bin/kumo-manager
 kumo_server_binary = ${kumo:location}/bin/kumo-server
@@ -45,7 +45,7 @@ link_binary_list =
   ${w3m:location}/bin/w3m
   ${xpdf:location}/bin/pdfinfo
   ${xpdf:location}/bin/pdftotext
-  ${xtrabackup:location}/bin/xtrabackup_51
+#  ${xtrabackup:location}/bin/xtrabackup_51
 
 # XXX: products won't be needed as soon as all ERP5 (and products-deps)
 # products will be eggified so then it will be possible to use them thanks to