[docs] Create docs for seed server installation

[Artur Kaszuba]

We need to describe how to install seed server from puppet manifests.
This server store iso files which are used by systest jobs, it is required by CI.

Please describe:
- system requirements for seed
- how to install seed server from puppet manifests, describe changes required in hiera and on puppet server
- other changes required to use it

[Igor Shishkin (teran)]

The same as here: https://bugs.launchpad.net/fuel/+bug/1510556
Please provide more details.

[Artur Kaszuba (akaszuba)]

In scenario with basic CI i need only shared place for builded ISO, with upload access from slaves.

I dont check how exactly seed works and where it is used, sorry if my description is not precise :)
That what i test already requires:
- allow ISO upload from slave (i set it in fuel_project::apps::seed::vhost_acl_allow)
- allow download ISO from torrent (i assume there should be torrent tracker installed on seed server)

For my tests i took hiera role example and remove from there partnershare and partnerappliance. Probably we can remove more but i dont had time to test it more accurately. My hiera for seed.test.local looks like this:
---
classes:
  - '::fuel_project::common'
  - '::fuel_project::apps::seed'
  - '::fuel_project::apps::mirror'
  - '::fuel_project::apps::plugins'
  - '::fuel_project::apps::updates'
# - '::fuel_project::apps::partnerappliance'
# - '::fuel_project::apps::partnershare'

#fuel_project::common::external_host: true

fuel_project::apps::seed::vhost_acl_allow:
  - 127.0.0.1
  - 10.0.0.0/8

fuel_project::apps::seed::external_host: true
fuel_project::apps::seed::apply_firewall_rules: true
fuel_project::apps::seed::tracker_apply_firewall_rules: true
fuel_project::apps::seed::seed_cleanup_dirs:
  -
    dir: '/var/www/seed/fuelweb-iso'
    ttl: 10
    pattern: 'fuel-*'

fuel_project::apps::mirror::apply_firewall_rules: true
fuel_project::apps::plugins::apply_firewall_rules: true
fuel_project::apps::updates::apply_firewall_rules: true

[Artur Kaszuba (akaszuba)]

@Igor, do you need some additional informations about this bug? It still have Incomplete status.

[Igor Shishkin (teran)]

@Artur, no, everything is good now. Confirmed state set.

[OpenStack Infra (hudson-openstack)]

Related fix proposed to branch: master
Review: https://review.openstack.org/259962

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/259962
Committed: https://git.openstack.org/cgit/openstack/fuel-web/commit/?id=cb22d7d6913bc999e892237cd6e313dd6c198801
Submitter: Jenkins
Branch: master

commit cb22d7d6913bc999e892237cd6e313dd6c198801
Author: Mateusz Matuszkowiak <email address hidden>
Date: Wed Dec 30 10:48:50 2015 +0100

    seed server deployment docs related to Fuels infra

    Change-Id: Ic891b69cda21fdaadfb63bd6d04eadfe8422de73
    Related-Bug: #1510551