Improve MySQL Galera password handling - use dedicated not root credentials

Prod related PROD-23926 (PROD:23926)

Change-Id: I1c09b54e22ac274336597fff6582a5b997f13ea4
diff --git a/README.rst b/README.rst
index 788e908..3e44619 100644
--- a/README.rst
+++ b/README.rst
@@ -33,6 +33,9 @@
         admin:
           user: root
           password: pass
+        sst:
+          user: sstuser
+          password: sstpassword
         database:
           name:
             encoding: 'utf8'
@@ -62,6 +65,10 @@
         admin:
           user: root
           password: pass
+        sst:
+          user: sstuser
+          password: sstpassword
+
 
 Enable TLS support: