[config] update /var/run -> /run for systemd

This gets rid of the warning:
> May 19 10:56:32 buster systemd[1]: /lib/systemd/system/lighttpd.service:6:
> PIDFile= references path below legacy direct

[config] update /var/run -> /run for systemd

This gets rid of the warning:
> May 19 10:56:32 buster systemd[1]: /lib/systemd/system/lighttpd.service:6:
> PIDFile= references path below legacy directory /var/run/,
> updating /var/run/lighttpd.pid → /run/lighttpd.pid;
> please update the unit file accordingly.

refs:
- https://github.com/systemd/systemd/commit/a2d1fb882c4308bc10362d971f333c5031d60069
- https://github.com/systemd/systemd/pull/9019
- https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=929203
- Filesystem Hierarchy Standard 3.0 (FHS 3.0)

github: closes #100

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[doc] systemd socket activation config example

(minor edits by gstrauss)

github: closes #96

x-ref:
"doc/systemd: add example lighttpd.socket for systemd socket activation"
https://github.com/l

[doc] systemd socket activation config example

(minor edits by gstrauss)

github: closes #96

x-ref:
"doc/systemd: add example lighttpd.socket for systemd socket activation"
https://github.com/lighttpd/lighttpd1.4/pull/96

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[doc] lighttpd.service uses network-online.target

doc/systemd/lighttpd.service now uses After=network-online.target
instead of After=network.target, as recommended in
https://www.freedesktop.org/w

[doc] lighttpd.service uses network-online.target

doc/systemd/lighttpd.service now uses After=network-online.target
instead of After=network.target, as recommended in
https://www.freedesktop.org/wiki/Software/systemd/NetworkTarget/

(thx janik)

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[doc] SIGUSR1 doc and lighttpd-angel SIGUSR1

lighttpd-angel:
add paranoid check to avoid sending kill(-1, <signal>) as root

set systemd settings similar to lighttpd2

except that HUP does not reload lighttpd 1.4.x config
Those who only use systemd lighttpd service 'reload' to rotate
access log files might choose to add a

set systemd settings similar to lighttpd2

except that HUP does not reload lighttpd 1.4.x config
Those who only use systemd lighttpd service 'reload' to rotate
access log files might choose to add a command to send lighttpd a
HUP signal. See github pull request (below) for further discussion.

[patch edited by gstrauss]

x-ref:
https://github.com/lighttpd/lighttpd1.4/pull/72

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[doc] add systemd/lighttpd.service to Makefiles, so it ends up in the tarball

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2821 152afb58-edef-0310-8abb-c4023f1b3aa9

[doc] add systemd lighttpd.service file

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2818 152afb58-edef-0310-8abb-c4023f1b3aa9