[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/.gitignore b/.gitignore
index 96e76c1..fcf3cdd 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,6 @@
+# Unit tests
+__snapshot__
+
 # Application
 kubernetes/config/onap-parameters.yaml
 kubernetes/dist/*
@@ -22,4 +25,3 @@
 
 # Mac OS
 *DS_Store*
-