[Users] Network custom properties

[Lior Vernia]

Hello all,

Introducing the oVirt 3.5 feature of network custom properties:
http://www.ovirt.org/Features/Network_Custom_Properties

Essentially, this feature aims to solve two RFEs, that request the
ability to set bridge and ethtool options on host interfaces from the
GUI/REST:
https://bugzilla.redhat.com/show_bug.cgi?id=1080984
https://bugzilla.redhat.com/show_bug.cgi?id=1080987

It will do so by adding custom properties (key:value pairs) to networks
assigned to host interfaces, which can in turn be acted upon via hooks
when e.g. a Setup Networks command is triggered.

Two predefined keys will include bridge_opts and ethtool_opts, but any
arbitrary custom property could be supplied as well.

Please take a look at the detailed feature page and let me know if you
have any comments.

Yours, Lior.