Fix template issue with user_data_config_drive

Fix a python3 error that prevented to use the user_data_config_drive
option when building amphorae.

user_data_config_drive has been broken since we switched to python3,
a mix of str and bytes variables were provided to the jinja2 templates.
This commit ensures that the type of all the certificates provided to
jinja2 are strings.

Story: 2005553
Task: 30705

Change-Id: I53ed0425f00cfbbc964f5083b4f2942cf5bf565e
(cherry picked from commit 64d8d991f1)

octavia/controller/worker/v1/tasks/compute_tasks.py

@@ -165,7 +165,8 @@ class CertComputeCreate(ComputeCreate):
         key = utils.get_compatible_server_certs_key_passphrase()
         fer = fernet.Fernet(key)
         config_drive_files = {
-            '/etc/octavia/certs/server.pem': fer.decrypt(server_pem),
+            '/etc/octavia/certs/server.pem': fer.decrypt(
+                server_pem).decode('utf-8'),
             '/etc/octavia/certs/client_ca.pem': ca}
         return super().execute(
             amphora_id, config_drive_files=config_drive_files,

octavia/controller/worker/v2/tasks/compute_tasks.py

@@ -173,7 +173,7 @@ class CertComputeCreate(ComputeCreate):
         fer = fernet.Fernet(key)
         config_drive_files = {
             '/etc/octavia/certs/server.pem': fer.decrypt(
-                server_pem.encode("utf-8")),
+                server_pem.encode("utf-8")).decode("utf-8"),
             '/etc/octavia/certs/client_ca.pem': ca}
         return super().execute(
             amphora_id, config_drive_files=config_drive_files,

octavia/tests/unit/controller/worker/v1/tasks/test_compute_tasks.py

@@ -391,7 +391,8 @@ class TestComputeTasks(base.TestCase):
             user_data='user_data_conf',
             config_drive_files={
                 '/etc/rsyslog.d/10-rsyslog.conf': 'FAKE CFG',
-                '/etc/octavia/certs/server.pem': fer.decrypt(test_cert),
+                '/etc/octavia/certs/server.pem': fer.decrypt(
+                    test_cert).decode('utf-8'),
                 '/etc/octavia/certs/client_ca.pem': 'test',
                 '/etc/octavia/amphora-agent.conf': 'test_conf'},
             server_group_id=SERVER_GRPOUP_ID,

octavia/tests/unit/controller/worker/v2/tasks/test_compute_tasks.py

@@ -404,7 +404,7 @@ class TestComputeTasks(base.TestCase):
             config_drive_files={
                 '/etc/rsyslog.d/10-rsyslog.conf': 'FAKE CFG',
                 '/etc/octavia/certs/server.pem': fer.decrypt(
-                    test_cert.encode('utf-8')),
+                    test_cert.encode('utf-8')).decode('utf-8'),
                 '/etc/octavia/certs/client_ca.pem': 'test',
                 '/etc/octavia/amphora-agent.conf': 'test_conf'},
             server_group_id=SERVER_GRPOUP_ID,

releasenotes/notes/fix-user_data_config_drive-b4ce8cc66fb21365.yaml

@@ -0,0 +1,6 @@
+---
+fixes:
+  - |
+    Fix a python3 error that prevented to use the
+    ``[controller_worker]/user_data_config_drive`` option when building
+    amphorae.