Each of these include an option for --current-context that set or retrieves
the curret context
This patchset mainly creates the cmd/config and pkg/config require additions
Also includes a fync getCurrentContext(<CLUSTERTYPE>) in the config pkg
that other modules should rely on.
Introduces new ErrMissingConfig and ErrConfigFailed types been used by
set-context, will decimate through get/ and set/get cluster after this is
reviewed.
Change-Id: I501483a9db99f33f860eaf329a65bb0209b2aaff
a480527808