Adding SRU proposal for Trusty.

** Description changed:

+ [Impact]
+ 
+  * In some configurations recurrent ifup/down calls are broken due to a
+ false-positive recursion detection.
+ 
+  * In certain situations it leaves interfaces unconfigured (in this
+ case: WLAN interface connected to WiFi network, but dhcp fails).
+ 
+ [Test Case]
+ 
+  * Setup wpa-roam configuration based on what is in comment #6
+  
+  * Wait until wpa_supplicant connects to a wifi network
+ 
+  * Run ifconfig to check if the WLAN interface received dhcp info
+ 
+  * Expected result: WLAN is fully configured according to dhcp settings
+  
+  * Actual result: WLAN is connected to WiFi but not configured
+ 
+ [Regression Potential]
+ 
+  * Fixed upstream, fix present in Xenial.
+ 
+  * Debdiffs contain a backport of an upstream fix.
+ 
+ [Other Info]
+  
+  * Original bug description:
+ 
  The following versions of ifupdown introduced a recursion check using 
"IFUPDOWN_<interface>" environment variables along with a new locking mechanism 
for ifup (see #1337873):
  0.7.47.2ubuntu4.2 (in Trusty)
  0.7.54ubuntu1.1 (in Wily)
  0.7.54ubuntu2 (in Xenial)
  
  This recursion check breaks the wpa-roam feature of wpasupplicant,
  preventing it from loading the logical interface specified by id_str
  after associating with an AP.  Specifically, after upgrading to one of
  the above ifupdown versions, the '/sbin/ifup -v --force
  "$WPA_IFACE=$WPA_LOGICAL_IFACE"' command run by wpa_action in
  functions.sh fails with an "ifup: recursion detected for parent
  interface wlan0 in post-up phase" error.
  
  To fix the issue, functions.sh needs to run `unset "IFDOWN_$WPA_IFACE"`
  before calling /sbin/ifup to prevent ifup from detecting the recursion.
  The attached patch implements this change.

** Patch added: "trusty_ifupdown_0.7.47.2ubuntu4.4.debdiff"
   
https://bugs.launchpad.net/ubuntu/+source/wpa/+bug/1545302/+attachment/4574279/+files/trusty_ifupdown_0.7.47.2ubuntu4.4.debdiff

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https://bugs.launchpad.net/bugs/1545302

Title:
  wpa-roam broken by fix for ifupdown #1337873

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