[NBI] Use the common galera cluster of ONAP

Instead of having our "own" galera cluster, use the common one already
proposed by OOM.
If a local cluster is needed, you just need to set
global.mariadbGalera.localCluster to True.

Also create a common chart that create the needed values for the
database.

Change-Id: I9ad551b76a40732b4ab3fc34ba7cde6ca90fe432
Issue-ID: EXTAPI-348
Signed-off-by: Sylvain Desbureaux <sylvain.desbureaux@orange.com>
diff --git a/kubernetes/nbi/requirements.yaml b/kubernetes/nbi/requirements.yaml
index c4d65a7..f0c4b8e 100644
--- a/kubernetes/nbi/requirements.yaml
+++ b/kubernetes/nbi/requirements.yaml
@@ -26,3 +26,8 @@
   - name: mariadb-galera
     version: ~5.x-0
     repository: '@local'
+    condition: global.mariadbGalera.localCluster
+  - name: mariadb-init
+    version: ~5.x-0
+    repository: '@local'
+    condition: not global.mariadbGalera.localCluster