erp5: mariadb import script: abort if mariadb was not started.

stack/erp5/buildout.cfg

@@ -150,7 +150,7 @@ context =
 [mariadb-resiliency-after-import-script]
 recipe = slapos.recipe.build:download
 url = ${:_profile_base_location_}/template/instance-mariadb-resiliency-after-import-script.sh.in
-md5sum = 8db483ef7c3da79a1cb5ea07ba79a0ed
+md5sum = a4738534a7e0e19af8a6e90e24029cf3
 mode = 755
 
 [template-mariadb]

stack/erp5/template/instance-mariadb-resiliency-after-import-script.sh.in

@@ -40,6 +40,11 @@ echo "Starting mariadb..."
 # XXX hardcoded
 $instance_directory/etc/run/mariadb &
 mysqld_pid=$!
+sleep 15
+# If mysql has stopped, abort
+if ! $(kill -0 $mysql_pid 2>/dev/null); then
+  exit 1
+fi
 $instance_directory/etc/run/mariadb_update > /dev/null 2>&1
 
 echo "Importing data..."