Relation support for multi-charm VNFs

Adds support for establishing relations between charms

Signed-off-by: Adam Israel <adam.israel@canonical.com>
Change-Id: I9a0b7725013e06635875cd824e219ab6a023efb3
diff --git a/tests/charms/layers/native-ci/metadata.yaml b/tests/charms/layers/native-ci/metadata.yaml
index 6acf296..0460e48 100644
--- a/tests/charms/layers/native-ci/metadata.yaml
+++ b/tests/charms/layers/native-ci/metadata.yaml
@@ -4,3 +4,9 @@
 maintainer: Adam Israel <adam.israel@canonical.com>
 subordinate: false
 series: ['xenial']
+provides:
+    db:
+        interface: mysql
+requires:
+    app:
+        interface: mysql