[Bug 1929825] [NEW] [Ubuntu 21.04] OSA Device doesn't get enabled if a vlan is specified on the kernel cmdline for the installer

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The OSA Device doesn't get enabled if a vlan is specified on the kernel
cmdline for the installer.

with the cmdline
`ip=10.1.8.74::10.1.10.1:255.255.252.0::enc800.300:none nameserver=10.1.9.101 vlan=enc800.300:enc800 url=http://10.1.9.101:1002/iso/ubuntu-21.04-live-server-s390x.iso quiet ---`

the boot fails with this message and drops to a shell:
```
BusyBox v1.30.1 (Ubuntu 1:1.30.1-6ubuntu2) built-in shell (ash)
Enter 'help' for a list of built-in commands.
 
(initramfs) [6n
ip: SIOCGIFFLAGS: No such device
ip: can't find device 'enc800'
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
ipconfig: enc800.300: SIOCGIFINDEX: No such device
ipconfig: no devices to configure
no search or nameservers found in /run/net-enc800.300.conf /run/net-*.conf /run/
net6-*.conf
Connecting to 10.1.9.101:1002 (10.1.9.101:1002)
wget: can't connect to remote host (10.1.9.101): Network is unreachable
Unable to find a live file system on the network
```

It the zdev 800 doesn't get enabled.
``` 
ip addr
1: lo: <LOOPBACK> mtu 65536 qdisc noop qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
(initramfs) [6n
lszdev | grep 0.0.0800
qeth         0.0.0800:0.0.0801:0.0.0802  no  no
```

But I can enable it manually:
```
chzdev -e 800
QETH device 0.0.0800:0.0.0801:0.0.0802 configured
Note: The initial RAM-disk must be updated for these changes to take effect:
       - QETH device 0.0.0800:0.0.0801:0.0.0802
A manual update of the initial RAM-disk is required.
(initramfs) [6n
ip addr
1: lo: <LOOPBACK> mtu 65536 qdisc noop qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enc800: <BROADCAST,MULTICAST> mtu 1500 qdisc noop qlen 1000
    link/ether f2:ae:7d:de:88:a0 brd ff:ff:ff:ff:ff:ff
```

The same cmdline (adjusted for the iso url) works on 20.04.
Between 20.04 and 21.04 the line 318 `echo "${VLAN}" | grep -q "${dev}" && continue` was added to /scripts/functions in the initrd.ubuntu. If I remove this line and repack the ramdisk the network boot works as expected like on ubuntu 20.04

** Affects: ubuntu-z-systems
     Importance: High
         Status: Fix Released

** Affects: initramfs-tools (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: architecture-s39064 bugnameltc-192957 severity-high targetmilestone-inin2104
-- 
[Ubuntu 21.04] OSA Device doesn't get enabled if a vlan is specified on the kernel cmdline for the installer
https://bugs.launchpad.net/bugs/1929825
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