Add a missing lock to cluster handler
Add a missing lock to cluster handler

kingland/vault,hartsock/vault,quixoten/vault,hashicorp/vault,joelthompson/vault,rnaveiras/vault,rnaveiras/vault,quixoten/vault,hartsock/vault,kingland/vault,kingland/vault,hashicorp/vault,joelthompson/vault,hartsock/vault,rnaveiras/vault,quixoten/vault,rnaveiras/vault,hashicorp/vault,kingland/vault,kingland/vault,hashicorp/vault,hashicorp/vault,quixoten/vault,joelthompson/vault,hartsock/vault,hashicorp/vault,joelthompson/vault,hartsock/vault,rnaveiras/vault