ctprobe: upgrade to conntrackprobe v0.2

[stefanberger]

Conntrackprobe v0.2 implements the socket-datacollector functionality of writing received data into a file in JSON format. So we don't need to start socket-datacollector anymore when using conntrackprobe, so we have a single process monitoring network connection creations using netlink. Using conntrackprobe v0.2 has some consequences on the ctprobe plugin since it doesn't need to start socket-datacollector anymore, which allows us to remove some code. I made the code a bit more robust against killling of conntrackprobe so that it gets restarted on next crawl().

Stefan

[codecov-io]

Codecov Report

Merging #310 into master will increase coverage by 0.02%. The diff coverage is 90.62%.

@@            Coverage Diff             @@
##           master     #310      +/-   ##
==========================================
+ Coverage   88.91%   88.93%   +0.02%     
==========================================
  Files         115      115              
  Lines        4581     4582       +1     
==========================================
+ Hits         4073     4075       +2     
+ Misses        508      507       -1

Impacted Files	Coverage Δ
...awler/plugins/systems/ctprobe_container_crawler.py	88.31% <90.62%> (-0.39%)	:arrow_down:
crawler/utils/dockerutils.py	96.68% <0%> (+0.82%)	:arrow_up:

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[sahilsuneja1]

Looks good!

1. Do you still need original solution of softflowd + socker-datacollector, or can we remove these dependencies?
2. Which language is Conntrackprobe written in? If python, can we make its code part of the plugin itself and avoid the .deb route?
3. Please squash the commits together

[stefanberger]

@sahilsuneja1 1) I want to still keep softflowd in the case of overlapping IP addresses, which wouldn't be handled by this plugin. 2) conntrackprobe is here: https://github.ibm.com/stefanb/conntrackprobe It's a daemon itself and would be much too complicated to put into the core crawler. 3) Done.

[stefanberger]

@sahilsuneja1 Thanks.