Update LDAP "groups" parameter to use TypeCommaStringSlice (#6942)
Update LDAP "groups" parameter to use TypeCommaStringSlice (#6942)

No functional change, but the updated type plays nicer with the
OpenAPI-driven UI.
hashicorp/vault,hashicorp/vault,hashicorp/vault,rnaveiras/vault,quixoten/vault,kingland/vault,rnaveiras/vault,hartsock/vault,rnaveiras/vault,hashicorp/vault,kingland/vault,rnaveiras/vault,hashicorp/vault,hartsock/vault,hashicorp/vault,rnaveiras/vault,quixoten/vault,hartsock/vault,hartsock/vault,kingland/vault,quixoten/vault,joelthompson/vault,kingland/vault,joelthompson/vault,joelthompson/vault,joelthompson/vault,hartsock/vault,kingland/vault,quixoten/vault