old_contents: import os
  
  default_envs = {
      'NODE_NAME': 'unknown_pod',
      'CI_DEBUG': 'true'
  }
  
  
  class Environment(object):
      def __init__(self):
          for k, v in os.environ.iteritems():
              self.__setattr__(k, v)
          for k, v in default_envs.iteritems():
              if k not in os.environ:
                  self.__setattr__(k, v)
  
  
  ENV = Environment()
  
new_contents: import os
  
  default_envs = {
      'NODE_NAME': 'unknown_pod',
      'CI_DEBUG': 'true',
      'DEPLOY_SCENARIO': 'os-nosdn-nofeature-noha',
      'DEPLOY_TYPE': 'virt',
      'INSTALLER_TYPE': None,
      'INSTALLER_IP': None,
      'BUILD_TAG': None
  }
  
  
  class Environment(object):
  
      def __init__(self):
          for k, v in os.environ.iteritems():
              self.__setattr__(k, v)
          for k, v in default_envs.iteritems():
              if k not in os.environ:
                  self.__setattr__(k, v)
  
  
  ENV = Environment()
  
subject: Add default env variables in ENV class