move slackwebhook migration from tools to util

tools isn't shipped inside of the container because it contains private
keys

tools/migrateslackwebhook.py

@@ -1,52 +0,0 @@
-import logging
-import json
-
-from app import app
-from data.database import configure, RepositoryNotification, ExternalNotificationMethod
-
-configure(app.config)
-
-logger = logging.getLogger(__name__)
-
-def run_slackwebhook_migration():
-  slack_method = ExternalNotificationMethod.get(ExternalNotificationMethod.name == "slack")
-
-  encountered = set()
-  while True:
-    found = list(RepositoryNotification.select().where(
-                      RepositoryNotification.method == slack_method,
-                      RepositoryNotification.config_json ** "%subdomain%",
-                      ~(RepositoryNotification.config_json ** "%url%")))
-
-    found = [f for f in found if not f.uuid in encountered]
-
-    if not found:
-      logger.debug('No additional records found')
-      return
-
-    logger.debug('Found %s records to be changed', len(found))
-    for notification in found:
-      encountered.add(notification.uuid)
-
-      try:
-        config = json.loads(notification.config_json)
-      except:
-        logging.error("Cannot parse config for noticification %s", notification.uuid)
-        continue
-
-      logger.debug("Checking notification %s", notification.uuid)
-      if 'subdomain' in config and 'token' in config:
-        subdomain = config['subdomain']
-        token = config['token']
-        new_url = 'https://%s.slack.com/services/hooks/incoming-webhook?token=%s' % (subdomain, token)
-        config['url'] = new_url
-
-        logger.debug("Updating notification %s to URL: %s", notification.uuid, new_url)
-        notification.config_json = json.dumps(config)
-        notification.save()
-
-if __name__ == "__main__":
-  logging.basicConfig(level=logging.DEBUG)
-  logging.getLogger('boto').setLevel(logging.CRITICAL)
-
-  run_slackwebhook_migration()