Added os-brick changes to support NVMEoF for initiator CLI.
A New connector, NVMe connector, is added to handle initiator callsi for
connecting and disconnecting volumes to instances using nvme-cli over
RDMA.
Implements: blueprint nvme-over-fabirc-nova
Needed-By: I67a72c4226e54c18b3a6e4a13b5055fa6e85af09
Needed-By: I7cacd76c63e0ad29eb2d448ce07fbb5176f62721
Co-Authored-By: Ivan Kolodyazhny <e0ne@e0ne.info>
Change-Id: I83697d6b46248edbe0a0ef3b76829b28ed5c048c