Volume type specific real_usages entries have to be initialised first

[berendt]

cinder-quota-sync/cinder-quota-sync

Line 246 in 410b861

real_usages["gigabytes_" + volume_types[type_id]] += size

Traceback (most recent call last):                                                                                                                                                                                                       
  File "cinder/quota-sync.py", line 278, in <module>                                                                                                                                                                                     
    main()                                                                                                                                                                                                                               
  File "cinder/quota-sync.py", line 236, in main                                                                                                                                                                                         
    real_usages["volumes_" + volume_types[type_id]] += 1                                                                                                                                                                                 
KeyError: None                                                                                                                                                                                                                           

In https://github.com/cernops/cinder-quota-sync/blob/master/cinder-quota-sync#L239-L240 only the generic counter is initialised. Volume type specific counter is not initialises. Because of this a += 1 does not work.