Release sync for 20.08

- Classic charms: sync charm-helpers.
- Classic ceph based charms:  also sync charms.ceph
- Reactive charms: trigger a rebuild
- sync tox.ini
- sync requirements.txt and test-requirements.txt

Change-Id: Iaf412e8cc8b438dff38b39ed7f4967147f321448

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
-9214c92e-a4d0-11ea-915f-67e17f5df20f
+da212bf4-d02c-11ea-9d4a-afaa8746d15a

requirements.txt

@@ -1,3 +1,10 @@
-# Requirements to build the charm
-charm-tools
+# This file is managed centrally by release-tools and should not be modified
+# within individual charm repos.  See the 'global' dir contents for available
+# choices of *requirements.txt files for OpenStack Charms:
+#     https://github.com/openstack-charmers/release-tools
+#
+# Build requirements
+charm-tools>=2.4.4
+# importlib-resources 1.1.0 removed Python 3.5 support
+importlib-resources<1.1.0
 simplejson

test-requirements.txt

@@ -1,7 +1,23 @@
-# Unit test requirements
-flake8>=2.2.4
+# This file is managed centrally by release-tools and should not be modified
+# within individual charm repos.  See the 'global' dir contents for available
+# choices of *requirements.txt files for OpenStack Charms:
+#     https://github.com/openstack-charmers/release-tools
+#
+# Lint and unit test requirements
+flake8>=2.2.4,<=2.4.1
 stestr>=2.2.0
+requests>=2.18.4
 charms.reactive
 mock>=1.2
+nose>=1.3.7
 coverage>=3.6
-git+https://github.com/openstack/charms.openstack#egg=charms.openstack
+git+https://github.com/openstack/charms.openstack.git#egg=charms.openstack
+#
+# Revisit for removal / mock improvement:
+netifaces        # vault
+psycopg2-binary  # vault
+tenacity         # vault
+pbr              # vault
+cryptography     # vault, keystone-saml-mellon
+lxml             # keystone-saml-mellon
+hvac             # vault, barbican-vault