Move docker name to settings.

Change-Id: I2a3679e99ee79f8b12a78e8a90c7dd409daeb309
diff --git a/tcp_tests/settings.py b/tcp_tests/settings.py
index 70b66d9..a1b296a 100644
--- a/tcp_tests/settings.py
+++ b/tcp_tests/settings.py
@@ -53,6 +53,8 @@
 
 DOCKER_REGISTRY = os.environ.get('DOCKER_REGISTRY',
                                  'docker-prod-virtual.docker.mirantis.net')
+DOCKER_NAME = os.environ.get('DOCKER_NAME',
+                             'mirantis/oscore/rally-tempest:latest')
 
 PATTERN = os.environ.get('PATTERN', None)
 RUN_TEMPEST = get_var_as_bool('RUN_TEMPEST', False)