** Description changed:

  For snappy (at first at least) we need to provide netplan in xenial, as
  for the first snappy GA release we must not use any PPAs any more.
  
  netplan's NetworkManager backend depends on two patches to read
  configuration and connections from /run/NetworkManager/. These will need
  to be backported for full netplan support; but they are not required for
  snappy as this will use a snapped NM. However, this will need a
  temporary hack
  (https://code.launchpad.net/%7Emorphis/netplan/+git/netplan/+merge/306607)
  until snaps can actually properly support OS components like
  NetworkManager.
  
  PATCHES:
  
https://git.launchpad.net/~network-manager/network-manager/+git/ubuntu/commit/?h=xenial&id=6dcdb85
  
https://anonscm.debian.org/cgit/pkg-systemd/systemd.git/commit/?h=ubuntu-xenial&id=4e9c52b0bb
  
  REGRESSION POTENTIAL:
  netplan: The risk for existing installations is practically zero as nplan 
does not exist in xenial yet and thus will not be pulled in during upgrades.
- NetworkManager: Nothing in xenial expects/uses /run/NetworkManager/ and as 
it's an ephemeral tmpfs there is no risk of existing files there. If the 
patches are broken it could in theory happen that NetworkManager also does not 
properly read files from /etc/NetworkManager/ any more, so the -proposed 
package must verify that existing connections still work.
- systemd: This does change behavior of networkd on restart, but the previous 
behaviour was arguably buggy. networkd is not being used by default or 
advertised in Ubuntu 16.04, so this will not affect the vast majority of 
installations.
+ 
+ NetworkManager: Nothing in xenial expects/uses /run/NetworkManager/ and
+ as it's an ephemeral tmpfs there is no risk of existing files there. If
+ the patches are broken it could in theory happen that NetworkManager
+ also does not properly read files from /etc/NetworkManager/ any more, so
+ the -proposed package must verify that existing connections still work.
+ 
+ systemd: This does change behavior of networkd quite a bit: RA is now
+ being handled in userpsace instead of the kernel, there are some new
+ virtual device types, LLDP support, etc., and there are no (known)
+ backwards incompatibilities. The 229 version was known buggy with DHCPv6
+ (we disabled these two test cases), and judging by the feedback in
+ Debian 231 is now reasonably stable. networkd is not being used by
+ default or advertised in Ubuntu 16.04 (so far), so this will not affect
+ the vast majority of installations. But while we have quite good test
+ coverage, it cannot be ruled out that we break some custom setup that
+ uses networkd.
  
  TEST PLAN:
  1. Run "NetworkManager --print-config" and save the output.
  2. Install the proposed NetworkManager and confirm that existing connections 
(from /etc/NetworkManager/system-connections) still work.
  3. Run "NetworkManager --print-config" again and verify that the output is 
the same as in step 1.
  4. netplan has a very comprehensive integration test suite run as 
autopkgtest, which covers NetworkManager (including the /run patches) and 
network. Confirm that it succeeds.

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https://bugs.launchpad.net/bugs/1627641

Title:
  Backport netplan to xenial

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