Adding the unified2 analyzer.

- This isn't connected to anything yet.
Rework the DHCP analyzer to make it compatible again.
Merge branch 'master' into topic/vladg/dhcp
DHCP:

 - Added the known-devices log, and the script to log DHCP hostname per MAC address,
 - Added DPD sig,
 - Removed some scripts following a discussion with Seth.
DHCP: Adding unit tests.
Pluginizing the DNP3 analyzer, plus a basic script logging requests
and replies.

Almost ready, but now 1 test fails again ...

[Note I broke git history by copying over the files into a new branch.]
Add debugging code to find FP inconsistency.
Merge remote-tracking branch 'origin/topic/seth/sumstats-updates'

* origin/topic/seth/sumstats-updates:
  Still fixing bugs in sumstats updated api cluster support.
  Hopefully fix the SumStats cluster support.
  Fix the SumStats top-k plugin and test.
  Updates for SumStats API to deal with high memory stats.
  Beginning rework of SumStats API.
  Tiny fix to account for missing str field  (not sure how this happens yet)
  Add server samples to SSH bruteforce detection.
  Fix a reporter message in sumstats.
  SumStats changes to how thresholding works to simplify and reduce memory use.
  More adjustments to try and correct SumStats memory use.
  Hopefully fixing a strange error.
  Large update for the SumStats framework.
Fix a major memory issue in the SumStats framework.

 - There are still problems, but this should prevent a deadlock issue
   and help with memory use.
Update baseline with now correct FP tests.
Remove debugging code.
Merge remote-tracking branch 'origin/topic/vladg/dhcp'

* origin/topic/vladg/dhcp:
  DHCP: Adding unit tests.
  DHCP:
  Rework the DHCP analyzer to make it compatible again.
Merge branch 'master' into topic/robin/dhcp-merge
Updating tests for DHCP.
Change to SSL log delay to cause the log to write even if delay times out.
Fix the SSL infinite loop I just created.
Merge remote-tracking branch 'origin/master' into topic/seth/unified2-analyzer

Conflicts:
	src/CMakeLists.txt
Fix a unit test outdated by recent sumstats changes.
Fix mem leak in DHCP analyzer.
Update coverage baselines for canonical load order of scripts.