Updates for testing period for 20.01 release

Includes updates to charmhelpers/charms.openstack for cert_utils
and unit-get for the install hook error on Juju 2.9

* charm-helpers sync for classic charms
* rebuild for reactive charms
* ensure tox.ini is from release-tools
* ensure requirements.txt files are from release-tools
* On reactive charms:
  - ensure master branch for charms.openstack
  - ensure master branch for charm-helpers
* Include NoNetworkBinding late fix.

func-test-pr: https://github.com/openstack-charmers/zaza/pull/409
Change-Id: I1a97004410c5cf4ef98164281137bce46756b12c

charmhelpers/contrib/openstack/ip.py

@@ -123,6 +123,28 @@ def _get_address_override(endpoint_type=PUBLIC):
         return addr_override.format(service_name=service_name())
 
 
+def local_address(unit_get_fallback='public-address'):
+    """Return a network address for this unit.
+
+    Attempt to retrieve a 'default' IP address for this unit
+    from network-get. If this is running with an old version of Juju then
+    fallback to unit_get.
+
+    Note on juju < 2.9 the binding to juju-info may not exist, so fall back to
+    the unit-get.
+
+    :param unit_get_fallback: Either 'public-address' or 'private-address'.
+                              Only used with old versions of Juju.
+    :type unit_get_fallback: str
+    :returns: IP Address
+    :rtype: str
+    """
+    try:
+        return network_get_primary_address('juju-info')
+    except (NotImplementedError, NoNetworkBinding):
+        return unit_get(unit_get_fallback)
+
+
 def resolve_address(endpoint_type=PUBLIC, override=True):
     """Return unit address depending on net config.
 
@@ -176,7 +198,7 @@ def resolve_address(endpoint_type=PUBLIC, override=True):
         if config('prefer-ipv6'):
             fallback_addr = get_ipv6_addr(exc_list=vips)[0]
         else:
-            fallback_addr = unit_get(net_fallback)
+            fallback_addr = local_address(unit_get_fallback=net_fallback)
 
         if net_addr:
             resolved_address = get_address_in_network(net_addr, fallback_addr)