Add a trigger to (un)register system user/groups.

The following vars can be used for this:

- system_accounts="foo blah"
- foo_homedir, foo_shell, foo_descr, foo_groups.

--HG--
extra : convert_revision : bc7d002e00abc5c84f83a3716a8ecf97f9c9ff24

xbps-src/triggers/initramfs-tools

@@ -1,4 +1,4 @@
-#!/bin/sh -e -e
+#!/bin/sh -e
 #
 # Runs update-initramfs(8) to create/update an initramfs for specified
 # version (if the pkg that is triggering it) or for the currently