bluemix-cli: init at 0.6.6

[tazjin]

Adds the (non-free, binary) IBM Bluemix CLI which is required to
administrate IBM Bluemix services.

Motivation for this change

A friend needed access to this tool on NixOS and I used it as an example for walking him through how to package upstream binaries in Nix.

Submitting because it may be useful to other people, too, though i don't intend to personally maintain version updates for this package (which I hope is fine).

Things done

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.

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[Mic92]

@GrahamcOfBorg eval