Updated CLI content with some restructuring [tech_review]

[Bilhar-rh]

@nhr @danmcp My first take on some rework of the CLI content that was migrated. A couple of questions though:

1. What is osc? How do you get it/install it?
2. In "Configuring CLI" it mentions that "configuration options are well documented." Where? Shouldn't they be documented here? If not, can you point to where they are documented?

[nhr]

@CowboysFan:

1. Good question. In reality, it is a symbolic link to the openshift binary, both of which must be available in $PATH. When invoked in this context, the binary is clever enough to behave as though the user is running openshift cli. However, until there is an installer for OpenShift 3, this symlink must be created manually. We can document that, but the situation is hopefully temporary.
2. Sorry, thinking like an engineer, not a human :-) osc --help returns all of the possible arguments to osc.

[nhr]

@CowboysFan let me know if you want to update your PR based on that feedback or merge it as-is.

[Bilhar-rh]

@nhr Thanks for the explanation. If no. 1 is temporary then I think we'll leave that as-is. As for no. 2 it sounds like I have it covered. If you can ack the tech_review, then please merge, or I'll be happy to merge after ack.