[Bug 1914740] [NEW] IPs are not assigned for Hipersockets in DHCP mode

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---Problem Description---
IPs are not getting assigned for Hipersockets in DHCP mode
 
Contact Information = Asha Shekharappa(ashshekh at in.ibm.com)  Sankar(sankar453 at in.ibm.com) 
 
---uname output---
52-Ubuntu SMP Thu Sep 10 10:59:04 UTC 2020 s390x s390x s390x GNU/Linux
 
Machine Type = s390x 
 
---Debugger---
A debugger is not configured
 
---Steps to Reproduce---
 Ubuntu 20.04
Netplan with systemd-networkd as renderer

Creating ethernet connection on Hipersockets device in DHCP mode fails
to assign IPs

1. Configure a Hipersockets device
   chzdev -e 0.0.8f00

2. Create a .yaml file with the below details

network:
    version: 2
    ethernets:
        enc8f00:
            dhcp4: yes

3. netplan apply


4. The IP is not assigned as seen below

root at M96SANKAR:/etc/netplan# ip a s

enc8f00: <BROADCAST,MULTICAST,NOARP,UP,LOWER_UP> mtu 32768 qdisc mq state UP group default qlen 1000
    link/ether fe:da:af:44:08:02 brd ff:ff:ff:ff:ff:ff

** Affects: ubuntu-z-systems
     Importance: Undecided
         Status: New

** Affects: netplan.io (Ubuntu)
     Importance: Undecided
     Assignee: Skipper Bug Screeners (skipper-screen-team)
         Status: New


** Tags: architecture-s39064 bugnameltc-191225 severity-high targetmilestone-inin2004
-- 
IPs are not assigned for Hipersockets in DHCP mode
https://bugs.launchpad.net/bugs/1914740
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