iofogctl command injection via Controller provisioning response

In Eclipse ioFog iofogctl versions 1.0.0 through 3.7.0 and 3.8.0-rc.1 through 3.9.1, the provisioning key and CA certificate returned by the Controller API are concatenated into shell commands (`edgelet provision` and `edgelet config cert` on supported releases; `iofog-agent provision` and `iofog-agent cert` on older releases) that run over SSH on a remote agent host and via a local shell. A party who can change that API response can include shell metacharacters and cause the operator's CLI to run additional commands on the agent host when the operator deploys or attaches an agent. This is fixed in version 3.9.2.