Allow `openshift kube` to talk to two servers

OpenShift supports `--kubernetes` to point the master to an existing Kube installation.  When doing that, the CLI can't handle both server URLs at once (because it assumes `--host` points to both).  As a short term workaround, allow clients who are talking to Kube *AND* OpenShift on two different servers to do:

    $ openshift kube --host "127.0.0.1:8080,127.0.0.1:8081" list pods
    $ openshift kube --host "127.0.0.1:8080,127.0.0.1:8081" list projects

The list of hosts must be comma-delimeted - if one is specified, it's used for both.  If two are specified, the first is Kubernetes and the second is OpenShift.  You can set this as an ENV var with:

    $ export KUBERNETES_MASTER="127.0.0.1:8080,127.0.0.1:8081"
    $ openshift kube list pods
    $ openshift kube list projects

Be advised that setting KUBERNETES_MASTER like this will confuse the Kubernetes command line binary from Kube.