Implements NVMeOF driver to support NVMe target CLI.
A new target, NVMET, is added for the LVM driver, and allows
cinder to use nvmetcli in order to create/delete subsystems
on attaching/detaching an LVM volume.
By choosing target_helper as nvmet, target_protocol as rdma,
other parameters can be configured too in cinder.conf like
nvmet_port_id, nvmet_ns_id (for namespace) and
nvmet_subsystem_name. The target IP and port, that will be
used by nvmecli OS-brick NVMe connector, are taken from
target_ip and target_port in cinder.conf.
Implements: blueprint nvme-target-cli
Change-Id: I7cacd76c63e0ad29eb2d448ce07fbb5176f62721
8d7e131c58