Fix server test that fails build under 1.11 (#5264)
Fix server test that fails build under 1.11 (#5264)

command/server_test.go:147:2: finished declared but not used
vet: typecheck failures
hashicorp/vault,hartsock/vault,hashicorp/vault,joelthompson/vault,kingland/vault,rnaveiras/vault,kingland/vault,hartsock/vault,quixoten/vault,quixoten/vault,kingland/vault,rnaveiras/vault,hartsock/vault,quixoten/vault,rnaveiras/vault,hashicorp/vault,kingland/vault,hartsock/vault,rnaveiras/vault,hashicorp/vault,hashicorp/vault,kingland/vault,rnaveiras/vault,joelthompson/vault,hartsock/vault,hashicorp/vault,joelthompson/vault,quixoten/vault,joelthompson/vault