Co-install supervisor and cluster-control CLIs

/to @chandadharap @raymondfeng 

I want to re-release loopback-workspace and then strong-cli, this will complete the strong-supervisor publish (https://strongloop.atlassian.net/browse/SLN-724).

strong-supervisor is published

explicit calls to strong-agent and strong-cluster-control were removed from loopback-workspace and sls-sample-app master branches

for that removal to be seen, strong-cli needs re-releasing

also, to make the sl-run and clusterctl utilities get co-installed with slc, the package.json changes in this PR are needed