[refactoring] Rules for different domains should be separated

i. e. do not mix rules for mysqld_t and mysqld_safe_t.

This enhances commit:
45d5f31

Author: FaramosCZ

mysql.te

@@ -178,6 +178,10 @@ optional_policy(`
 	daemontools_service_domain(mysqld_t, mysqld_exec_t)
 ')
 
+optional_policy(`
+	hostname_exec(mysqld_t)
+')
+
 optional_policy(`
     openshift_search_lib(mysqld_t)
 ')
@@ -258,7 +262,6 @@ mysql_write_log(mysqld_safe_t)
 
 optional_policy(`
 	hostname_exec(mysqld_safe_t)
-	hostname_exec(mysqld_t)
 ')
 
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