illumos gate

While testing with a Micron card nvmeadm was unable to handle the EUI64 namespace identifier and started throwing errors.
For example:

1. nvmeadm identify nvme1/cfe000030e791300
   nvmeadm: invalid namespace cfe000030e791300
   nvme1: Identify Controller
   Controller Capabilities and Features
   Model: MTFDHAX2T4MCF-1AN1ZABYY
   Serial: P60727043123
   ...
   ...

The attached patch makes it handle EUI64 identifier strings as opposed to namespace numbers. I did basic testing with identify, get-features and get-logpage which is what we need.
Though, I am not sure if everything is handled or this is the proper approach.

Details of the Micron card:

1. nvmeadm list
   nvme1: model: MTFDHAX2T4MCF-1AN1ZABYY, serial: P60727043123, FW rev: 0091634, NVMe v1.1
   nvme1/cfe000030e791300 (c1tCFE000030E791300d0): Size = 2289272 MB, Capacity = 2289272 MB, Used = 2289272 MB