nvme-cli: Release v1.2

nvme-cli: Release v1.2

Changes in this release:

  New vendor pluging from Western Digital.

  Better memory usage on program tear down. Will be more important if
  we have an interactive mode in the future.

  Minor code reorganization to keep vendor uniqueness out of common code.

  Conditionally compile without uuid support if library is not
  installed. This is mainly to silence the complaints, as having libuuid
  is very useful for fabrics.

  Documentation updates and fixes.

Signed-off-by: Keith Busch <keith.busch@intel.com>