xcute: Only allow one job at the same time on all meta2 services

When the peers are changed, the old value is overwritten.
Thus, if 2 jobs change the peers at the same time,
one of the 2 values will be overwritten by the other
and the peers will not be good.

oio/xcute/jobs/meta2_decommissioner.py

@@ -68,7 +68,7 @@ def sanitize_params(cls, job_params):
 
         sanitized_job_params['dst'] = job_params.get('dst')
 
-        return sanitized_job_params, 'meta2/%s' % src
+        return sanitized_job_params, 'meta2'
 
     def __init__(self, conf, logger=None):
         super(Meta2DecommissionJob, self).__init__(conf, logger=logger)

oio/xcute/jobs/meta2_rebuilder.py

@@ -65,7 +65,7 @@ def sanitize_params(cls, job_params):
             raise ValueError('Missing service ID')
         sanitized_job_params['service_id'] = service_id
 
-        return sanitized_job_params, 'meta2/%s' % service_id
+        return sanitized_job_params, 'meta2'
 
     def __init__(self, conf, logger=None):
         super(Meta2RebuildJob, self).__init__(conf, logger=logger)