[Bug 1763608] [NEW] Netplan ignores Interfaces without IP Addresses

[Johannes Krude]

Public bug reported:

The "manual" method in /etc/network/interfaces resulted in an interface
being brought up, but not having an IP address assigned.

When configuring an Interface without an IP Address, netplan ignores the
interface instead of bringing it up.

---
network:
  version: 2
  renderer: networkd
  ethernets:
    eth1: {}

Expected result from `netplan apply`: eth1 is brought up.
Actual result: eth1 is still down.

Similarly `netplan generate` does not generate any file in
/run/systemd/network for eth1.

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

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https://bugs.launchpad.net/bugs/1763608

Title:
  Netplan ignores Interfaces without IP Addresses

Status in nplan package in Ubuntu:
  New

Bug description:
  The "manual" method in /etc/network/interfaces resulted in an
  interface being brought up, but not having an IP address assigned.

  When configuring an Interface without an IP Address, netplan ignores
  the interface instead of bringing it up.

  ---
  network:
    version: 2
    renderer: networkd
    ethernets:
      eth1: {}

  Expected result from `netplan apply`: eth1 is brought up.
  Actual result: eth1 is still down.

  Similarly `netplan generate` does not generate any file in
  /run/systemd/network for eth1.

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