Remove CI votes metric

This patch removes processing of CI votes. The reasons are:
 * CI votes rely on DriverLog database which is deprecated
 * CI votes are collected from comments to patch sets, querying
   comments significantly increases the load on Gerrit
 * CI votes are not actively used by community
 * CI votes provide only partial look into state of third-party
   drivers.

This reverts commits:
   a6ff499de3
   1b6a5fe764
   03be2b4e19
   94f371d543
   5ad1cbe79c

Change-Id: Ie30b68c54b8d6fac6330481bf83bd1b2c4bfa190

stackalytics/processor/config.py

@@ -46,10 +46,6 @@ PROCESSOR_OPTS = [
                help='SSH key for gerrit review system access'),
     cfg.StrOpt('ssh-username', default='user',
                help='SSH username for gerrit review system access'),
-    cfg.StrOpt('driverlog-data-uri',
-               default='https://git.openstack.org/cgit/'
-                       'openstack/driverlog/plain/etc/default_data.json',
-               help='URI for default data'),
     cfg.StrOpt('translation-team-uri',
                default='https://git.openstack.org/cgit/openstack/i18n/'
                        'plain/tools/zanata/translation_team.yaml',