Fix missing parameters on other backup providers

Author: dploeger

manifests/backup/mysqlbackup.pp

@@ -29,6 +29,8 @@
   $optional_args            = [],
   $incremental_backups      = false,
   $install_cron             = true,
+  $compression_command      = undef,
+  $compression_extension    = undef,
 ) inherits mysql::params {
   mysql_user { "${backupuser}@localhost":
     ensure        => $ensure,

manifests/backup/xtrabackup.pp

@@ -31,6 +31,8 @@
   $additional_cron_args     = '--backup',
   $incremental_backups      = true,
   $install_cron             = true,
+  $compression_command      = undef,
+  $compression_extension    = undef,
 ) inherits mysql::params {
   ensure_packages($xtrabackup_package_name)