tests/vm: ubuntu.i386: apt proxy setup

Configure apt proxy so package downloads
can be cached and can pass firewalls.

Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20190617043858.8290-12-kraxel@redhat.com>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>

tests/vm/ubuntu.i386

@@ -51,6 +51,10 @@ class UbuntuX86VM(basevm.BaseVM):
                           "    ssh-authorized-keys:\n",
                           "    - %s\n" % basevm.SSH_PUB_KEY,
                           "locale: en_US.UTF-8\n"])
+        proxy = os.environ.get("http_proxy")
+        if not proxy is None:
+            udata.writelines(["apt:\n",
+                              "  proxy: %s" % proxy])
         udata.close()
         subprocess.check_call(["genisoimage", "-output", "cloud-init.iso",
                                "-volid", "cidata", "-joliet", "-rock",