Improve Ubuntu server boot performance

Because booting Ubuntu servers is taking long time
on upstream CI test_curl often fails after waiting
for a long time for cloud-init makes its job.

This bypasses depending on cloud init execution by
moving the logic to write host ID file on the first
boot script defined in the customised cloud image.

Change-Id: Ibd89354646b27684ed140471b6482ea77addd8a3

tobiko/openstack/stacks/_ubuntu.py

@@ -13,12 +13,14 @@
 #    under the License.
 from __future__ import absolute_import
 
+import typing
+
 import tobiko
 from tobiko import config
 from tobiko.openstack import glance
-from tobiko.openstack import nova
 from tobiko.openstack.stacks import _nova
 
+
 CONF = config.CONF
 
 UBUNTU_IMAGE_VERSION = 'focal'
@@ -49,12 +51,26 @@ class UbuntuImageFixture(UbuntuMinimalImageFixture,
     The server has additional commands compared to the minimal one:
       iperf3
       ping
+      ncat
+      nginx
+
+    The image will also have a running HTTPD server listening on
+    TCP port 80
     """
 
-    install_packages = ['iperf3',
-                        'iputils-ping',
-                        'ncat',
-                        'nginx']
+    @property
+    def firstboot_commands(self) -> typing.List[str]:
+        return super().firstboot_commands + [
+            'sh -c "hostname > /var/www/html/id"']
+
+    @property
+    def install_packages(self) -> typing.List[str]:
+        return super().install_packages + ['iperf3',
+                                           'iputils-ping',
+                                           'ncat',
+                                           'nginx']
+
+    http_port = 80
 
 
 class UbuntuFlavorStackFixture(_nova.FlavorStackFixture):
@@ -83,13 +99,9 @@ class UbuntuServerStackFixture(UbuntuMinimalServerStackFixture):
     image_fixture = tobiko.required_setup_fixture(UbuntuImageFixture)
 
     # port of running HTTP server
-    http_port = 80
-
     @property
-    def cloud_config(self):
-        return nova.cloud_config(
-            super().cloud_config,
-            runcmd=["sh -c 'hostname > /var/www/html/id'"])
+    def http_port(self) -> int:
+        return self.image_fixture.http_port
 
 
 class UbuntuExternalServerStackFixture(UbuntuServerStackFixture,

tobiko/tests/functional/shell/test_curl.py

@@ -23,10 +23,11 @@ import testtools
 import tobiko
 from tobiko.shell import curl
 from tobiko.shell import ssh
+from tobiko.openstack import keystone
 from tobiko.openstack import stacks
 
 
-@tobiko.skip("Flaky test case")
+@keystone.skip_unless_has_keystone_credentials()
 class TestCurl(testtools.TestCase):
 
     stack = tobiko.required_setup_fixture(stacks.UbuntuServerStackFixture)