[Bug 1849608] [NEW] systemd resolv should separate the output of stdout and stderr

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The file /etc/dhcp/dhclient-enter-hooks.d/resolved
provided by systemd (242-7ubuntu3) causes the dhclient failing to get DNS due to systemd-resolved is not run.
This issue can be reproduced on Ubuntu Eoan:
==============================
root at eoan:~# dhclient -v 
Internet Systems Consortium DHCP Client 4.4.1
Copyright 2004-2018 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/ens224/00:0c:29:92:d4:da
Sending on   LPF/ens224/00:0c:29:92:d4:da
Listening on LPF/ens192/00:0c:29:92:d4:d0
Sending on   LPF/ens192/00:0c:29:92:d4:d0
Listening on LPF/ens160/00:0c:29:92:d4:c6
Sending on   LPF/ens160/00:0c:29:92:d4:c6
Sending on   Socket/fallback
DHCPDISCOVER on ens224 to 255.255.255.255 port 67 interval 3 (xid=0x6d9fb33d)
DHCPDISCOVER on ens192 to 255.255.255.255 port 67 interval 3 (xid=0xeb8fda26)
DHCPREQUEST for 192.168.120.4 on ens160 to 255.255.255.255 port 67 (xid=0x6d39545d)
DHCPACK of 192.168.120.4 from 192.168.120.254 (xid=0x5d54396d)
RTNETLINK answers: File exists
d41d8cd98f00b204e9800998ecf8427e  /run/systemd/resolved.conf.d/isc-dhcp-v4-ens160.conf
md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-ens160.conf: No such file or directory
5025823d750dda1f3f15e306c4a0afce  /run/systemd/resolved.conf.d/isc-dhcp-v4-ens160.conf
md5sum: /run/systemd/resolved.conf.d/isc-dhcp-v6-ens160.conf: No such file or directory
bound to 192.168.120.4 -- renewal in 111 seconds.
root at eoan:~# resolvectl status |grep DNS
MulticastDNS setting: no
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
          DNSSEC NTA: 10.in-addr.arpa
MulticastDNS setting: no
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
MulticastDNS setting: no
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
MulticastDNS setting: no
  DNSOverTLS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
==============================

Attached please find the patch for this. The output for md5sum in the
hook file resolv should separate the stdout and stderr so it won't
compare the wrong data.

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

-- 
systemd resolv should separate the output of stdout and stderr
https://bugs.launchpad.net/bugs/1849608
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