openshift_checks: lb and nfs do not need docker

fixes bug 1496760
https://bugzilla.redhat.com/show_bug.cgi?id=1496760

roles/openshift_health_checker/openshift_checks/mixins.py

@@ -21,9 +21,11 @@ class DockerHostMixin(object):
 
     def is_active(self):
         """Only run on hosts that depend on Docker."""
-        is_containerized = self.get_var("openshift", "common", "is_containerized")
-        is_node = "oo_nodes_to_config" in self.get_var("group_names", default=[])
-        return super(DockerHostMixin, self).is_active() and (is_containerized or is_node)
+        group_names = set(self.get_var("group_names", default=[]))
+        needs_docker = set(["oo_nodes_to_config"])
+        if self.get_var("openshift.common.is_containerized"):
+            needs_docker.update(["oo_masters_to_config", "oo_etcd_to_config"])
+        return super(DockerHostMixin, self).is_active() and bool(group_names.intersection(needs_docker))
 
     def ensure_dependencies(self):
         """

roles/openshift_health_checker/test/docker_image_availability_test.py

@@ -21,14 +21,14 @@ def task_vars():
 
 
 @pytest.mark.parametrize('deployment_type, is_containerized, group_names, expect_active', [
-    ("origin", True, [], True),
-    ("openshift-enterprise", True, [], True),
     ("invalid", True, [], False),
     ("", True, [], False),
     ("origin", False, [], False),
     ("openshift-enterprise", False, [], False),
     ("origin", False, ["oo_nodes_to_config", "oo_masters_to_config"], True),
     ("openshift-enterprise", False, ["oo_etcd_to_config"], False),
+    ("origin", True, ["nfs"], False),
+    ("openshift-enterprise", True, ["lb"], False),
 ])
 def test_is_active(task_vars, deployment_type, is_containerized, group_names, expect_active):
     task_vars['openshift_deployment_type'] = deployment_type