[atlas] Atlas nagios tools

Hello all,

i would like to introduce a tool[1] i have been developing on and off
for a bit of time.  its uses the atlas latest call[2] and sagan[3] to
preform nagios checks based on measurement results.  it supports
checking a wide range of ssl, dns and http parameters which i have tried
to document on github[1].  it also supports checking ping however i
think it is better to use the atlas status checks[4][5] for this.

The git hub repo contains some sample nagios configs which can be seen
in action at https://icinga.johnbond.org/ (ripeatlas/ripeatlas).

at $dayjob we dont use nagios/icinga so this is not well tested and one
should expect some bugs.  if you dare inspect the source you can
definitely expect spelling mistakes and hacks.

Thanks to Iñigo Ortiz de Urbina and Wolfgang Nagele for patches.  Also
thanks to Daniel Quinn and  Philip Homburg for working with me
integrating some changes to sagan.

feedback, criticism and patches most welcome

John

*as http is a restricted measurement this has received little testing
[1]https://github.com/b4ldr/atlas
[2]https://labs.ripe.net/Members/suzanne_taylor_muzzin/ripe-atlas-latest-results-api-and-parsing-library
[3]https://github.com/RIPE-NCC/ripe.atlas.sagan
[4]https://labs.ripe.net/Members/suzanne_taylor_muzzin/introducing-ripe-atlas-status-checks
[5]https://github.com/RIPE-Atlas-Community/ripe-atlas-community-contrib/blob/master/scripts_for_nagios_icinga_alerts