__sysctl: Fix on NetBSD

See merge request !918

Fix global explorers for NetBSD

See merge request !917

On NetBSD sysctl is at /sbin/sysctl, but the default PATH does not
contain /sbin.

__locale_system: Wider OS support

See merge request !914

new type: __unpack

See merge request !893

[__unpack] no mkdir by default, because destination can be file, but tar needs mkdir andrar needs slash at the end

__key_value: Get AWK from POSIX PATH

See merge request !913

__package_apt: Fix for legacy APT versions that do not support --no-install-recommends.

See merge request !912

This is required here, because Solaris /usr/bin/awk does not support the
sub() function.
So xpg4 AWK needs to be used.

--no-install-recommends was introduced with Debian 5.
The APT::Install-Recommends option gets ignored by old versions and
produces no error.

Remove deprecated __pf_apply

See merge request !899

Add Alpine support to __openldap_server

See merge request !909

Hotfix:  Fix incorrect interpretation of --mode strings with leading 0s as octal

See merge request !911

__user: Install user{add,mod,del} packages on OpenWrt

See merge request !910

Merge branch 'bugfix/postfix-master-option' into master

See merge request !907

Fix broken --option parameter in __postfix_master type

See merge request !905

(cherry picked from commit 2f433a14)

9496b234 The option parameter is actually multi-valued
4009bbd7 Protect postfix variables in options

type/{__file/__directory}: Support setuid,setguid,sticky bits

See merge request ungleich-public/cdist!903