fix tls-relation for cross-model case

With cross-model relations (CMR), the "unit name" visible
on the offering side of the relation is a UUID which doesn't
match with the unit's own view of its unit name. Thus, the
unit cannot find the responses to its cert requests, as they
are keyed by the UUID rather than the unit name. By explicitly
publishing the unit name over the relation, it ensures that
the provider and requirer will use the same key.
We use the unit name rather than a UUID or nonce to ensure
that non-CMR deployments are not broken upon upgrade.

juju-solutions/interface-tls-certificates#16

Change-Id: I3df63b92fc25423d930b5bf1c263eb62125a0a3f

contrail-agent/hooks/contrail_agent_hooks.py

@@ -15,6 +15,7 @@
     related_units,
     status_set,
     unit_private_ip,
+    local_unit,
 )
 
 import contrail_agent_utils as utils
@@ -155,6 +156,8 @@ def _update_tls(rid=None):
 
 @hooks.hook('tls-certificates-relation-joined')
 def tls_certificates_relation_joined():
+    # in cross-model rellations we have to provide own name to be sure that we'll find it in response
+    relation_set(unit_name=local_unit().replace('/', '_'))
     _update_tls(rid=relation_id())
 
 

contrail-analytics/hooks/contrail_analytics_hooks.py

@@ -234,6 +234,8 @@ def _update_tls(rid=None):
 
 @hooks.hook('tls-certificates-relation-joined')
 def tls_certificates_relation_joined():
+    # in cross-model rellations we have to provide own name to be sure that we'll find it in response
+    relation_set(unit_name=local_unit().replace('/', '_'))
     _update_tls(rid=relation_id())
 
 

contrail-analyticsdb/hooks/contrail_analyticsdb_hooks.py

@@ -187,6 +187,8 @@ def _update_tls(rid=None):
 
 @hooks.hook('tls-certificates-relation-joined')
 def tls_certificates_relation_joined():
+    # in cross-model rellations we have to provide own name to be sure that we'll find it in response
+    relation_set(unit_name=local_unit().replace('/', '_'))
     _update_tls(rid=relation_id())
 
 

contrail-controller/hooks/contrail_controller_hooks.py

@@ -568,6 +568,8 @@ def _update_tls(rid=None):
 
 @hooks.hook('tls-certificates-relation-joined')
 def tls_certificates_relation_joined():
+    # in cross-model rellations we have to provide own name to be sure that we'll find it in response
+    relation_set(unit_name=local_unit().replace('/', '_'))
     _update_tls(rid=relation_id())
 
 

contrail-kubernetes-master/hooks/contrail_kubernetes_master_hooks.py

@@ -322,6 +322,8 @@ def _update_tls(rid=None):
 
 @hooks.hook('tls-certificates-relation-joined')
 def tls_certificates_relation_joined():
+    # in cross-model rellations we have to provide own name to be sure that we'll find it in response
+    relation_set(unit_name=local_unit().replace('/', '_'))
     _update_tls(rid=relation_id())