Update default_vars variables.

default_vars.py

@@ -57,13 +57,14 @@ except IOError as e:
 
 
 # Site
-env.drupal_version = 7
+env.drupal_version = 8
 env.site_root = 'src/drupal'
 env.site_drush_aliases = '{}/sites/all/drush'.format(env.site_root)
 env.site_name = 'Drupal'
 env.site_environment = 'local'
 env.site_profile = 'standard'
 env.site_profile_repo = ''
+env.site_conf = ''
 env.site_profile_makefile = 'build-standard-8.x.make.yml'
 env.site_profile_branch = ''
 env.site_db_user = 'dev'