This provides two plugins:
* arris-sb6183 - Power levels, SNR, error counts
* arris-sb6183_uptime - Uptime in days
These are two seperate plugins because it's two different
urls it needs to hit, and this seemed simpler.
arris-sb6183 provides multigraphs for each channel.
Signed-off-by: Nathaniel Clark <Nathaniel.Clark@misrule.us>
