Use macro for pid file location

See merge request !9

Previously a warning was given:

```
/usr/lib/systemd/user/aklog.service:9: PIDFile= path is not absolute, ignoring: ${XDG_RUNTIME_DIR}/krenew.pid
```

Replace this with the macro '%t' , see `man systemd.service` which
expanded to the same thing and presumably `verify` is smart enough
to know this will be a result.

End result after patch:

```
● aklog.service - Set up  AFS tokens and renew Kerberos
   Loaded: loaded (/usr/lib/systemd/user/aklog.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/user/aklog.service.d
           └─kdestroy.conf
   Active: active (running) since Tue 2022-07-05 10:49:20 CEST; 6min ago
  Process: 1590359 ExecStartPre=/usr/bin/aklog (code=exited, status=0/SUCCESS)
 Main PID: 1590375 (krenew)
   CGroup: /user.slice/user-16568.slice/user@16568.service/aklog.service
           └─1590375 /usr/bin/krenew -a -K 30 -i -v -L -t -p /run/user/16568/krenew.pid

```

as expected and:

```
$ systemctl show --user aklog -p PIDFile
PIDFile=/run/user/16568/krenew.pid
```

enable epel-testing during test phase

See merge request !8

Drop Hard Requirement on AFS

See merge request !7

Add the `-a` option.

Quoting the man page:

> When run with either the -K flag or a command, always renew tickets
each time krenew wakes up.  Without this option, krenew will only try to
renew a ticket as often as necessary to prevent the ticket from
expiring.  With this option, krenew will renew tickets according to the
interval specified with the -K flag.

> This behavior probably should have been the default behavior of -K.  The
default was not changed to avoid changes for existing users, but for
new applications, consider always using -a with -K.

krenew can create a pid file and systemd can use it so may as well

Renewal of kerberos tickets is useful even if no AFS is present.

Obvious example is aiadm-homeless.

In reality the aklog call could be completly removed since `-t` to
kstart does this.

Note it is not considered fatal to kstart if aklog is missing.

After this change:

```
ls /usr/bin/aklog
ls: cannot access '/usr/bin/aklog': No such file or directory
```

but we still have

```
systemctl --user status   aklog.service
● aklog.service
   Loaded: loaded (/home/straylen/.config/systemd/user/aklog.service; enabled; vendor preset: enabled)
  Drop-In: /etc/systemd/user/aklog.service.d
           └─kdestroy.conf
   Active: active (running) since Thu 2022-06-30 10:22:50 CEST; 2min 36s ago
  Process: 3303634 ExecStartPre=/usr/bin/aklog (code=exited, status=0/SUCCESS)
 Main PID: 3303636 (krenew)
   CGroup: /user.slice/user-16568.slice/user@16568.service/aklog.service
           └─3303636 /usr/bin/krenew -K 30 -i -v -L -t
```

So weird how it has process id and status=0/SUCCESS for it but does.

The downside of this is of course if aklog was present but failing for some reason
this would not be noticed....

Build for CS9

See merge request !4

Resolve  Assignment outside of section. Ignoring.

See merge request !3

Journal was showing:

```
Jul 30 11:16:39 lxplus805.cern.ch systemd[811083]:
/usr/lib/systemd/user/aklog.service:1: Assignment outside of section.
Ignoring.
Jul 30 11:16:39 lxplus805.cern.ch systemd[811083]:
/usr/lib/systemd/user/aklog.service:2: Assignment outside of section.
Ignoring.
Jul 30 11:16:39 lxplus805.cern.ch systemd[811083]:
/usr/lib/systemd/user/aklog.service:3: Assignment outside of section.
Ignoring.
```

Also removed is RemainAfterExit - since this command runs forever in
normal circumstance RemainAfterExit makes no sense to me.

Build an {8 stream, stream 8} Version

See merge request !2

Buildrequire systemd for rpm macros

See merge request !1

Steve Traylen authored Jan 17, 2020 and Ben Morrice committed Jan 17, 2020

With cern-aklog-systemd-user-1.0-1.el8.cern there are unxpanded macros

```
rpm -ql cern-aklog-systemd-user
/%{_userunitdir}/aklog.service
```

and

```
postinstall scriptlet (using /bin/sh):
%systemd_user_post aklog.service
preuninstall scriptlet (using /bin/sh):
%systemd_user_preun aklog.service
postuninstall scriptlet (using /bin/sh):
%systemd_user_postun_with_restart aklog.service
```

Buildrequire systemd to ensure they evaluated at rpm build time.