[salt.minion.cert] MySQL certificate and key

Adds ability to generate certificates and keys using
salt.minion.cert state for MySQL.

Usage:

Add the class to reclass model for db nodes:

classes:
 - system.salt.minion.cert.mysql.server

Apply state:
 salt 'db*' state.sls salt.minion.cert

PROD-14210
Change-Id: I8366dd618032c6179428ed5a25f59286fa518925
diff --git a/salt/minion/cert/mysql/init.yml b/salt/minion/cert/mysql/init.yml
new file mode 100644
index 0000000..a1c480f
--- /dev/null
+++ b/salt/minion/cert/mysql/init.yml
@@ -0,0 +1,13 @@
+parameters:
+  _param:
+    salt_minion_ca_host: cfg01.${_param:cluster_domain}
+    salt_minion_ca_authority: salt_master_ca
+  salt:
+    minion:
+      cert:
+        mysql_server:
+          host: ${_param:salt_minion_ca_host}
+          signing_policy: cert_server
+          authority: ${_param:salt_minion_ca_authority}
+          common_name: mysql_server
+          signing_policy: cert_open