TT#105871 Update kernel.core_pattern check for Debian/bullseye support

As of systemd v243 the kernel.core_pattern for systemd-coredump (once
again[1]) no longer includes the hostname, see systemd.git commit:

| commit 47cf786c0a13fccd777c334bed4b1e7b02f18d42
| Author: Franck Bui <fbui@suse.com>
| Date:   Fri Jun 21 13:12:41 2019 +0200
|
|    coredump: rely on /proc exclusively to get the name of the crashing process

[1] This is similar to a revert of our commit a78509496d,
which mentioned:

| commit f45b8015513d38ee5f7cc361db9c5b88c9aae704
| Author: Jakub Filak <jakub@thefilaks.net>
| Date:   Thu Feb 15 12:12:46 2018 +0100
|
|     coredump: accept hostname on command line (#8033)

We can't just revert the change though, as we need to distinguish between
Debian 11/bullseye and older releases, while commit a78509496d was
for Debian 10/buster and older releases.

Change-Id: I844bc6f23b1acd2ce583bc59f67ea70956863653

templates/610_kernel-sysctl-params.yaml.tt2

@@ -4,7 +4,11 @@ kernel-param:
     value: "1"
 
   kernel.core_pattern:
+{{if eq .Env.DEBIAN_RELEASE "11"}}
+    value: "|/lib/systemd/systemd-coredump %P %u %g %s %t 9223372036854775808 %h"
+{{else}}
     value: "|/lib/systemd/systemd-coredump %P %u %g %s %t 9223372036854775808 %h %e"
+{{end}}
 
   fs.suid_dumpable:
     value: "2"