Strip legacy prefix if it's present

Migrated jobs have the legacy- prefix which makes tracking things across
the migration a bit difficult. This commit strips that from the job
name on db insertion.

Change-Id: Ibfca7a7f4ff66ec6d3809f0ee96a98d598e27e91

files/subunit-gearman-worker.py

@@ -73,6 +73,8 @@ class SubunitRetriever(object):
             project = meta['project'].split('/')[-1]
             if project not in job_name:
                 job_name = '-'.join([job_name, project])
+        if job_name.startswith('legacy-'):
+            job_name = job_name[7:]
         meta['build_name'] = job_name
         return meta