Update references from ironic-discoverd to ironic-inspector since it is
the new name of the project starting from Liberty.
This commit also introduce a subtle change of semantic: what was
previously known as discovery is now called introspection.
Co-Authored-By: Ignacio Bravo <ibravo@hotmail.com>
Change-Id: If7618d9c9815ad201bafc0929fdf72120aba590f