clean default_vars.yml & deprecate ~12 playbooks to roles/deprecated

[holta]

@georgejhunt will clean up https://github.com/iiab/iiab/blob/master/vars/default_vars.yml so that it inherits a more real-world and lightweight set of defaults from http://wiki.laptop.org/go/IIAB/local_vars.yml [formerly http://wiki.laptop.org/go/IIAB/local_vars_lite.yml]

All together we will finalize (see draft @ http://minutes.iiab.io) which dozen-or-so underused and insecure playbooks will be deprecated and placed into /opt/iiab/iiab/roles/deprecated

[holta]

Ref #215 now being finalized, getting default_vars.yml much closer to the IIAB 6.4 runway-

[holta]

PR #219 is currently finalizing which playbooks to deprecate.

[holta]

Stuff that's now being deprecated (whatever is finally chosen in PR #219) should be visually commented out of default_vars.yml to make this deprecation abundantly clear to all. Something like the following?

# authserver
# authserver_install: False
# authserver_enabled: False

...

# ejabberd
# ejabberd_install: False
# ejabberd_enabled: False

# idmgr and activity-server
# idmgr_install: False
activity_server_install: False
# xo_services_enabled: False
# ejabberd_xs_install: False
# ejabberd_xs_enabled: False

# xovis
# xovis_install: False
# xovis_enabled: False
# xovis_target_host: "127.0.0.1:5984"
# xovis_deployment_name: olpc

# xovis_db_name: xovis
# xovis_db_user: admin
# xovis_db_password: admin

# xovis_root: "/opt/xovis"
# xovis_backup_dir: "/library/users"
# xovis_chart_heading: "My School: Usage Data Visualization"

# schooltool
# schooltool_install: False
# schooltool_enabled: False

# sugar-stats
# sugar_stats_install: False
# sugar_stats_enabled: False

# ajenti
# ajenti_install: False
# ajenti_enabled: False

# teamviewer
# teamviewer_install: False
# teamviewer_enabled: False