Swift: Can't get full backup-list on large bucket

[Maxime Brunet]

wal-e backup-list doesn't query the full backup list on large bucket.

get_container() from python-swiftclient lists buckets with a limit of 10000 containers by default. This can be easily waived by passing full_listing=True.

Documentation:
https://docs.openstack.org/python-swiftclient/pike/swiftclient.html#swiftclient.client.get_container

The calls to get_container() which need full_listing=True:

• wal-e/wal_e/worker/swift/swift_worker.py

  Lines 30 to 32 in b1bbead

   _, object_list = self.swift_conn.get_container( 
       self.layout.store_name(), prefix='/' + prefix 
   ) 

• wal-e/wal_e/worker/swift/swift_worker.py

  Lines 87 to 88 in b1bbead

   _, object_list = self.conn.get_container(self.layout.store_name(), 
                                            prefix='/' + prefix) 

• wal-e/wal_e/worker/swift/swift_worker.py

  Lines 109 to 110 in b1bbead

   _, object_list = self.conn.get_container(self.layout.store_name(), 
                                            prefix='/' + prefix)