Update command options in the Installation Guide

Fixed some of deprecated options.
  - python-glanceclient: --public option is ignored. (from version 0.15.0)
  - diskimage-builder: disk-image-get-kernel is deprecated.

Change-Id: I77154e578f5c98e8f3fb055005454d9a852f6c98
Merge "Update command options in the Installation Guide"