playbooks: roles: Drop obsolete dib-utils package

Upstream diskimage-builder commit d65678678ec0 ("Move dib-run-parts
into diskimage-builder") moved the dib-run-parts utility to the
diskimage-builder repository which effectively declared the dib-utils
package as retired. Therefore, there is no need to install this package
anymore.

Link: https://git.openstack.org/cgit/openstack/diskimage-builder/commit/?id=d65678678ec0416550d768f323ceace4d0861bca
Change-Id: I350f5028ca4f58227af80edaf4c56374dca0d9cb

playbooks/roles/bifrost-create-dib-image/README.md

@@ -98,11 +98,6 @@ cloud-init. If you have cloud-init enabled in your image(Ubuntu/Fedora) and you
 wish to allow configdrive to work with it, you set 'dib_init_element' to
 ['cloud-init-datasources'](http://docs.openstack.org/developer/diskimage-builder/elements/cloud-init-datasources/README.html).
 
-Dependencies
-------------
-
-dib-utils must be installed from pip for the image creation to work.
-
 Example Playbook
 ----------------
 

playbooks/roles/bifrost-ironic-install/tasks/install.yml

@@ -74,12 +74,6 @@
     when: shade_source_install | default(false) | bool
   when: skip_install is not defined
 
-- name: "dib-utils - install from pip"
-  include: pip_install.yml
-    package=dib-utils
-    state=present
-  when: skip_install is not defined and install_dib | bool == true
-
 - name: "Diskimage-builder - Install"
   include: pip_install.yml
     package=diskimage-builder