Fix #101: remove built-in inetd from finit

This patch removes the built-in inetd support from Finit.  We recommend
using an external inetd instead, e.g. xinetd.

If you liked the feature set our inetd provided; filtering per interface
and port redirection, then please let us know or use the code in this
patch (MIT licensed) to recreate it.  We are open to reintroducing it,
but then as a stand-alone daemon like the bundled watchdogd and getty.

So long for now, old friend.

Signed-off-by: Joachim Wiberg <troglobit@gmail.com>

ChangeLog.md

@@ -13,6 +13,9 @@ make sure to read the whole changelog when upgrading.
 
 ### Changes
 * Introducing Finit progress 𝓜𝓸𝓭𝓮𝓻𝓷
+* Removed built-in inetd super server.  If you need this functionality,
+  use an external inetd, like xinetd, instead.  A pull request for a
+  stand-alone inetd, like watchdogd and getty, is most welcome!
 * Incompatible `configure` script changes, i.e., you must give proper
   path arguments to the script, no more guessing just GNU defaults.
   There are examples in the documentation and the `contrib/` section
@@ -76,8 +79,7 @@ make sure to read the whole changelog when upgrading.
 * Drop `--enable-rw-roots` configure option, use `rw` for your `/`
   partition in `/etc/fstab` instead to trigger remount at boot
 * Drop default tty speed (38400) and use 0 (kernel default) instead
-* Make `:ID` optional for real, use NULL/zero internally and only
-  force :ID (numbered) for inetd services, this allows ...
+* Make `:ID` optional, use NULL/zero internally this allows ...
 * Handle use-cases where multiple services share the same PID filem
   and thus the same condition path, e.g. different instances for
   different runlevels.  Allow custom condition path with `name:foo`
@@ -95,14 +97,8 @@ make sure to read the whole changelog when upgrading.
 
 * Fix #96: Start udevd as a proper service
 * Ensure we track run commands as well as task/service, once per runlevel
-* Fix #98: FTBFS with `--disable-inetd`
-* Make sure to unblock UDP inetd services when connection terminates.
-  Regression introduced in v3.1
 * Ensure run/tasks also go to stopping state on exit, like services,
   otherwise it is unnecessarily hard to restart them
-* Fix #99: Do not try to `SIGKILL` inetd services, they are not backed
-  by a PID.  This caused a use after free issue crashing finit.  Found
-  and fixed by Tobias Waldekranz, Westermo
 * Fix missing OS/Finit title bug, adds leading newline before banner
 * Remove "Failed connecting to watchdog ..." error message on systems
   that do not have a watchdog
@@ -110,23 +106,14 @@ make sure to read the whole changelog when upgrading.
   not yet exist (symlink to `/run`).  Added compat layer for access
 * Fix #103: Register multiple getty if `@console` resolves to >1 TTY,
 * Fix #105: Only remove /etc/nologin when moving from runlevel 0, 1, 6
-* Fix #106: Don't mark inetd connections for deletion at .conf reload.
-  Fixed by Jonas Johansson, Westermo
-* Fix #107: Stop spawned inetd conncections when stopping inetd service.
   Fixed by Jonas Johansson, Westermo
 * Fix #109: Support for PID files in sub-directories to `/var/run`
 * Handle rename of PID files, by Robert Andersson, Atlas Copco
-* Fix #111: Only restart inetd services when necessary.  E.g., if the
-  listening interface is changed.  Only stop established connections
-  which are no longer allowed, i.e. do not touch already allowed
-  established connections.  Fixed by Jonas Johansson, Westermo
 * Fix #120: Redirect `stdin` to `/dev/null` for services by default
 * Fix #122: Switch to `nanosleep()` to achieve "signal safe" sleep,
   fixed by Jacques de Laval, Westermo
 * Fix #124: Lingering processes in process group when session leader
   exits.  E.g., lingering `logit` processes when parent dies
-* Fix: update inetd service args on config change.  Found and fixed by
-  Petrus Hellgren, Westermo
 * Fix service name matching, e.g. for condition handling, may match with
   wrong service, by Jonas Holmberg, Westermo
 * Run all run-parts scripts using `/bin/sh -c foo` just like the standard