mkmotd: Be less intrusive

Avoid dumb "to bee or not to bee" saying.

Avoid three out of four asterisks.

Avoid showing anything for empty policy

Seperate tags and policy by additional vertical space

Old:
```

  #     #                  ###         #     #  stairwaytoheaven
  ##   ##    ##    #####    #   #    #  #   #   system Supermicro 2023US-TR4
  # # # #   #  #   #    #   #   #    #   # #    cpu    128x AMD EPYC 7601
  #  #  #  #    #  #    #   #   #    #    # 64  ram    1027.6 GB
  #     #  ######  #####    #   #    #   # #    arch   x86_64 / 64-bit
  #     #  #    #  #   #    #   #    #  #   #   glibc  2.36
  #     #  #    #  #    #  ###   ####  #     #  kernel 5.15.131.mx64.457 #1

    / to bee or not to bee /   tags: amd confidential hitparade mx64 mxqd server
  ** MXQ cluster node - only to be used via mxqsub/mxqi **
  ** Access to confidential data enabled **

```

new:

```

  #     #                  ###         #     #  stairwaytoheaven
  ##   ##    ##    #####    #   #    #  #   #   system Supermicro 2023US-TR4
  # # # #   #  #   #    #   #   #    #   # #    cpu    128x AMD EPYC 7601
  #  #  #  #    #  #    #   #   #    #    # 64  ram    1027.6 GB
  #     #  ######  #####    #   #    #   # #    arch   x86_64 / 64-bit
  #     #  #    #  #   #    #   #    #  #   #   glibc  2.36
  #     #  #    #  #    #  ###   ####  #     #  kernel 5.15.131.mx64.457 #1

  tags: amd confidential hitparade mx64 mxqd server

  * MXQ cluster node - only to be used via mxqsub/mxqi
  * Access to confidential data enabled

```

mkmotd/mkmotd.pl

@@ -43,7 +43,7 @@
 
 EOF
 
-    $TEMPLATE .= "    / to bee or not to bee /   tags: ".join(" ",@hostconfig)."\n";
+    $TEMPLATE .= "  tags: ".join(" ",@hostconfig)."\n\n";
 }
 else {
     die "$os_release : unknown os_release\n";
@@ -201,5 +201,7 @@ sub policy {    # policy('theinternet') --> ('zeile1,'zeile2',....)
 
 $TEMPLATE =~ s/%(\S+?)%/$T{$1}||$1/eg;
 open O, '>', '/etc/motd' or die "/etc/motd: $!\n";
-print O $TEMPLATE, ( join( "\n", map ( "  ** $_ **", policy( $T{HOST} ) ) ) || "  ** **" ), "\n\n";
+print O $TEMPLATE;
+my @policy = policy($T{HOST});
+print O join("\n", map("  * $_", @policy)), "\n\n" if @policy;
 close O;