[Bug 1832404] [NEW] sit tunnel should not require the local param

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[Description]

When setting up a sit tunnel (with Hurricane Electric for example), one
can use a netplan config like (https://netplan.io/examples#connecting-
an-ip-tunnel) this:

network:
  version: 2
  ethernets:
    eth0:
      addresses:
        - 1.1.1.1/24
        - "2001:cafe:face::1/64"
      gateway4: 1.1.1.254
  tunnels:
    he-ipv6:
      mode: sit
      remote: 2.2.2.2
      local: 1.1.1.1
      addresses:
        - "2001:dead:beef::2/64
      gateway6: "2001:dead:beef::1"

This works well with a static IPv4 on eth0. Had eth0 been configured by
DHCP one would be tempted to omit the 'local' param and let the network
stack figure out which one to use to reach the remote endpoint. This
used to work that way with ifupdown but netplan complains:

  Error in network definition: he-ipv6: missing 'local' property for tunnel
      mode: sit
      ^


[Additional information]
# lsb_release -rd
Description:	Ubuntu 18.04.2 LTS
Release:	18.04
# apt-cache policy netplan.io
netplan.io:
  Installed: 0.97-0ubuntu1~18.04.1
  Candidate: 0.97-0ubuntu1~18.04.1
  Version table:
 *** 0.97-0ubuntu1~18.04.1 500
        500 http://archive.ubuntu.com/ubuntu bionic-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     0.40.1~18.04.4 500
        500 http://security.ubuntu.com/ubuntu bionic-security/main amd64 Packages
     0.36.1 500
        500 http://archive.ubuntu.com/ubuntu bionic/main amd64 Packages

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: netplan (not installed)
ProcVersionSignature: Ubuntu 4.15.0-51.55-generic 4.15.18
Uname: Linux 4.15.0-51-generic x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.6
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Tue Jun 11 16:26:25 2019
InstallationDate: Installed on 2018-07-15 (331 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180714)
ProcEnviron:
 LANG=en_CA.UTF-8
 TERM=xterm-256color
 SHELL=/bin/bash
 XDG_RUNTIME_DIR=<set>
 PATH=(custom, no user)
SourcePackage: plan
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: netplan.io (Ubuntu)
     Importance: Medium
         Status: Confirmed


** Tags: amd64 apport-bug bionic
-- 
sit tunnel should not require the local param
https://bugs.launchpad.net/bugs/1832404
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