instead of requiring distributions to construct a loop around sysctl
in boot scripts just scan a set of default directories if the --system
switch is used.
Config files are applied in alphabetic order of their base name.
Each base name is only applied once according to the directory
preference. /etc/sysctl.conf is always applied last.
Signed-off-by: Ludwig Nussel <ludwig.nussel@suse.de>
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
The sysctl now uses getopt_long and has help screen which be user
friendly. Rest of the modernization is left later, since this is
a command is used in scripts, and changing for instance error
printing to use warn & warnx could break stuff.
Signed-off-by: Sami Kerola <kerolasa@iki.fi>
