Gate: Attempt to fix a memory allocation error

This random error is due to the different swap space at different
test hosts. In particular, there is a provider who provides VMs with
0 swap space, while other providers provide VMs with 8G swap space.
As a result, Magnum jobs failed at VMs with 0 swap space.

This commit reduces memory consumption of Magnum jobs by reducing the
bay node flavor from 2G to 1G. I consider this as a temporary fix.
A permanent fix should be from infra side to make the swap space
consistent across test nodes.

Partial-Bug: #1521237
Change-Id: Ia043fab1f7665f7299e4094634e02c42b43dcce1

doc/source/dev/dev-functional-test.rst

@@ -40,7 +40,7 @@ Create the necessary keypair and flavor::
 
     source /opt/stack/devstack/openrc admin admin
     nova keypair-add --pub-key ~/.ssh/id_rsa.pub default
-    nova flavor-create  m1.magnum 100 2048 8 1
+    nova flavor-create  m1.magnum 100 1024 8 1
 
     source /opt/stack/devstack/openrc demo demo
     nova keypair-add --pub-key ~/.ssh/id_rsa.pub default

magnum/tests/contrib/post_test_hook.sh

@@ -94,7 +94,7 @@ nova keypair-add --pub-key ~/.ssh/id_rsa.pub default
 
 # Create magnum specific flavor for use in functional tests.
 echo_summary "Create a flavor"
-nova flavor-create  m1.magnum 100 2048 8 1
+nova flavor-create  m1.magnum 100 1024 8 1
 
 # Run functional tests
 # Currently we support functional-api, functional-k8s, will support swarm,

magnum/tests/functional/python_client_base.py

@@ -117,6 +117,7 @@ class BaseMagnumClient(base.TestCase):
             external_network_id=cls.nic_id,
             image_id=cls.image_id,
             flavor_id=cls.flavor_id,
+            master_flavor_id=cls.flavor_id,
             docker_volume_size=docker_volume_size,
             network_driver=network_driver,
             coe=coe,