[Bug 1315643] [NEW] powerwake should make a best-effort attempt to guess broadcast

[Adam Conrad]

Public bug reported:

When I powerwake by hostname or IP, powerwake knows what network that
is, and if we have a route for it, we should hit that subnet's
broadcast, rather than 255.255.255.255, which is less reliable.

Example here:

(base)adconrad at lucifer:~$ ip ro sh
default via 68.145.116.1 dev eth0 
10.0.0.0/27 dev br0  proto kernel  scope link  src 10.0.0.1 
68.145.116.0/22 dev eth0  proto kernel  scope link  src 68.145.119.149 

And a powerwake to 10.0.0.14 only works if I send it explicitly to
10.0.0.31.  This should be easily guessable without me having to hand-
hold.

** Affects: powernap (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1315643

Title:
  powerwake should make a best-effort attempt to guess broadcast

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