In 180-increase-arp-caches the same logic was called again
and again. This could be done by a function!

See https://git.c3pb.de/freifunk-pb/ffpb-packages/issues/2

gets changed. Therefore these scripts must be adjusted
to the new structure.

See: http://gluon.readthedocs.org/en/latest/dev/upgrade.html

Closes issue #2 by adding appropriate tests to the script as requested
by @hej, such that values that have already been set to a higher value
to not get changed.

As its name states, this packages applies some config optimizations
(like tweaking kernal knobs via sysctl) on the nodes.
For the most knobs Gluon sticks for OpenWRT defaults for good reasons,
as some values need to be set according to the environment of the
nodes (e.g. the network's size). As OpenWRT basically aims at provid-
ing a stable system for standalone WiFi access-points, the system's
default configuration may not be appropriate anymore the larger the
network grows, though.