Reorder configuration options for clarity

* Group options on conf.py and example.conf
* Fix one wrong option in example.conf

Change-Id: I820a77aaf5fd73094aa6ab9de770eb62db44d6d5
Make firewall management optional

Adds configuration option "manage_firewall" that allows disabling
firewall management completely. Handy for testing and for future
IPA integration work.

Change-Id: I8db1d5528650e24336ad87976459c57c753486a7
Closes-Bug: #1400475
Try to set boot device to PXE before rebooting

Change-Id: I4c50048f6ceac609315a08282a50c3ca61568d8f
Closes-Bug: #1401801
Merge "Reorder configuration options for clarity"
Merge "Make firewall management optional"
Add option to overwrite existing properties

Requested by Ironic upstream, disabled by default.

Change-Id: Ibcfe90875805ac31d5c36a7e9f8a7fb6b4bd6397
Closes-Bug: #1396604
added an eDeploy plugin

It receives eDeploy's hardware discovery to classify hardware
according to hardware profiles and extract the needed information for
the configuration of the node.

Change-Id: I11b4cf21ec81ce8efd3222597a5226fe260721e2