rename cmd/cli to cmd/infrakit

[chungers]

This PR renames the cmd/cli directory to cmd/infrakit so that a simple

go get github.com/docker/infrakit/cmd/infrakit
go install github.com/docker/infrakit/cmd/infrakit

will install the infrakit binary. After that the user can add a remote playbook and through the scripts in the playbook be able to dynamically pull the necessary containers and plugins.

Signed-off-by: David Chung david.chung@docker.com

[codecov]

Codecov Report

Merging #501 into master will decrease coverage by 0.04%.
The diff coverage is 0%.

@@            Coverage Diff             @@
##           master     #501      +/-   ##
==========================================
- Coverage   57.51%   57.47%   -0.05%     
==========================================
  Files          57       57              
  Lines        3771     3774       +3     
==========================================
  Hits         2169     2169              
- Misses       1323     1326       +3     
  Partials      279      279

Impacted Files	Coverage Δ
pkg/discovery/local/dir.go	52.63% <0%> (-2.17%)	⬇️

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