Make the SSH executable path configurable (#4937)
Make the SSH executable path configurable (#4937)

Making this configurable is useful for windows users which may not be
using the default `ssh` executable. It also means that users can point to a
specify SSH executable if multiple are available.
hashicorp/vault,rnaveiras/vault,hashicorp/vault,kingland/vault,joelthompson/vault,rnaveiras/vault,hartsock/vault,rnaveiras/vault,hartsock/vault,joelthompson/vault,hartsock/vault,hashicorp/vault,quixoten/vault,rnaveiras/vault,kingland/vault,quixoten/vault,quixoten/vault,joelthompson/vault,joelthompson/vault,kingland/vault,hashicorp/vault,kingland/vault,hartsock/vault,rnaveiras/vault,kingland/vault,quixoten/vault,hashicorp/vault,hashicorp/vault,hartsock/vault