The link options being set within the network files, which functional,
does not expose all of the link capabilities we have within a specific
link file. This change implements link files per network interface
giving the user the ability to customize links as they need.
Change-Id: Ie999c541a6a566141e81c6d9f95b8a30bbbefa8c
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>