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Raoul Scarazzini e9588bb424 Add external repo and img roles to bm undercloud

This commit replaces the actual repo configuration and overcloud
images preparation inclusions with the already existing external
dedicated roles (repo-setup and fetch-images).
To configure this the two playbooks are modified and a new "packages"
subrole is created under the main baremetal-undercloud one.
With this in place it is possible to follow this sequence:

- Provide and prepare the undercloud machine (role baremetal-undercloud)
- Inventory the newly created machine (role tripleo-inventory)
- Setup repositories (role repo-setup)
- Install and configure packages on undercloud (baremetal-undercloud's
  subrole named "packages"):
  - tripleo package
  - additional packages (optional)
  - ntp configuration (replaces what was done before in the custom
    template undercloud-repos-conf.sh.j2)
- Install the undercloud

A new review to update the documentation will be done after this gets
merged.

Change-Id: Iba11c4d61a63bb05016177abd16403168d82331b

2017-01-12 08:08:20 -05:00