Add baremetal to the CLI guide.

Add baremetal actions to the CLI guide, and add some samples showing how
to add baremetal nodes and interfaces.

Fixes bug 1133448

Also, cleans up the indentation in nova_cli_commands for readability.

Change-Id: I51e3253896b934df5e7b60fee62efc2fd1f38ef4
Merge "Add baremetal to the CLI guide."