Allow to set ssl grant options when creating galera databases

This patch allows to configure SSL grant options when creating
galera databases by specifying mysql_{service}_ssl_option param.

Change-Id: I6c7d82f62d20388033f608c1b4ca0269249807da
Related-Prod: PROD-17049
diff --git a/galera/server/database/panko.yml b/galera/server/database/panko.yml
index 7a3ed63..c4c455a 100644
--- a/galera/server/database/panko.yml
+++ b/galera/server/database/panko.yml
@@ -1,4 +1,6 @@
 parameters:
+  _param:
+    mysql_panko_ssl_option: []
   mysql:
     server:
       database:
@@ -9,7 +11,9 @@
             password: ${_param:mysql_panko_password}
             host: '%'
             rights: all
+            ssl_option: ${_param:mysql_panko_ssl_option}
           - name: panko
             password: ${_param:mysql_panko_password}
             host: ${_param:cluster_local_address}
             rights: all
+            ssl_option: ${_param:mysql_panko_ssl_option}