[train] Ensure get_requests_for_local_unit doesn't fail on incomplete relation

This is a rebuild/make sync for charms to pickup the fix in charmhelpers to fix
any inadvertant accesses of ['ca'] in the relation data before it is available
from vault in the certificates relation.  Fix in charmhelpers is in [1].

[1] https://github.com/juju/charm-helpers/pull/832
Closes-Bug: #2028683

Change-Id: I807086e6ceaabf0805b2a35c5a2902652bbdc698

bindep.txt

@@ -0,0 +1 @@
+libpq-dev [platform:dpkg]

rebuild

@@ -2,4 +2,4 @@
 # when dependencies of the charm change,
 # but nothing in the charm needs to.
 # simply change the uuid to something new
-53bf780c-1178-11ec-bc16-bb24856e98b0
+657a105a-3dbf-11ee-aa53-9fae6c70c681

src/build.lock

@@ -261,6 +261,12 @@
       "package": "urllib3",
       "vcs": null,
       "version": "1.26.7"
+    },
+    {
+      "type": "python_module",
+      "package": "Cython",
+      "vcs": null,
+      "version": "0.29.36"
     }
   ]
 }

src/tests/bundles/bionic-stein-s3.yaml

@@ -78,6 +78,7 @@ applications:
       openstack-origin: *openstack-origin
     to:
       - '6'
+    channel: train/edge
   swift-storage:
     charm: ch:swift-storage
     num_units: 1

src/tests/bundles/bionic-train-s3.yaml

@@ -78,6 +78,7 @@ applications:
       openstack-origin: *openstack-origin
     to:
       - '6'
+    channel: train/edge
   swift-storage:
     charm: ch:swift-storage
     num_units: 1

tox.ini

@@ -87,7 +87,8 @@ commands = stestr run --slowest {posargs}
 [testenv:pep8]
 basepython = python3
 deps = flake8==3.9.2
-       charm-tools==2.8.3
+       PyYAML==6.0.1
+       charm-tools==2.8.6
 commands = flake8 {posargs} src unit_tests
 
 [testenv:func-target]