Switch to using hostnames for addressing

K8S pods can change IP during charm upgrades; switch to using
the fully qualified hostname for participating units for
connectivity between units.  Hostnames won't change and are
dynamically managed by K8S.

Depends-On: Ief5c816ab5fbeb55aadf2b83697858f2ecb28807
Change-Id: Ib4629e0d2228ba2b94c7652d75ef861c8324441e

lib/charms/ovn_central_k8s/v0/ovsdb.py

@@ -37,7 +37,7 @@ LIBAPI = 0
 
 # Increment this PATCH version before using `charmcraft publish-lib` or reset
 # to 0 if you are raising the major API version
-LIBPATCH = 1
+LIBPATCH = 2
 
 
 # TODO: add your code here! Happy coding!
@@ -101,11 +101,11 @@ class OVSDBCMSRequires(Object):
         logging.debug("OVSDBCMSRequires on_joined")
         self.on.connected.emit()
 
-    def bound_addresses(self):
-        return self.get_all_unit_values("bound-address")
+    def bound_hostnames(self):
+        return self.get_all_unit_values("bound-hostname")
 
     def remote_ready(self):
-        return all(self.bound_addresses())
+        return all(self.bound_hostnames())
 
     def _on_ovsdb_cms_relation_changed(self, event):
         """OVSDBCMS relation changed."""

src/templates/ovn-relay-wrapper.sh.j2

@@ -27,6 +27,6 @@ ovsdb-server \
     --log-file=/var/log/ovn/ovn-relay.log \
     --pidfile=/var/run/ovn/ovn-relay.pid \
     --unixctl=/var/run/ovn/ovn_relay.sock \
-    --remote=pssl:6642:{{ ovsdb_cms.local_address }} relay:OVN_Southbound:$REMOTES
+    --remote=pssl:6642:{{ ovsdb_cms.local_hostname }} relay:OVN_Southbound:$REMOTES
 
 trap stop_svc EXIT