Notification of fully initialised Suricata v6

[rmcconnell-r7]

Make sure these boxes are signed before submitting your Pull Request -- thank you.

• [x] I have read the contributing guide lines at https://redmine.openinfosecfoundation.org/projects/suricata/wiki/Contributing
• [x] I have signed the Open Information Security Foundation contribution agreement at https://suricata.io/about/contribution-agreement/
• [x] I have updated the user guide (in doc/userguide/) to reflect the changes made (if applicable)

Link to redmine ticket: https://redmine.openinfosecfoundation.org/issues/5384

Describe changes:

• Rebased commits from master into branch (to keep up to date)

Replaces: #7589

#suricata-verify-pr: #suricata-verify-repo: #suricata-verify-branch: #suricata-update-pr: #suricata-update-repo: #suricata-update-branch: #libhtp-pr: #libhtp-repo: #libhtp-branch:

[rmcconnell-r7]

Replaces: #7589

[codecov[bot]]

Codecov Report

Merging #7632 (5eb54c8) into master (f8bf581) will increase coverage by 0.00%. The diff coverage is 68.29%.

@@           Coverage Diff           @@
##           master    #7632   +/-   ##
=======================================
  Coverage   75.75%   75.76%           
=======================================
  Files         659      659           
  Lines      185743   185781   +38     
=======================================
+ Hits       140713   140749   +36     
- Misses      45030    45032    +2     

Flag	Coverage Δ
fuzzcorpus	60.15% <2.56%> (+<0.01%)	:arrow_up:
suricata-verify	52.51% <71.79%> (+0.08%)	:arrow_up:
unittests	60.69% <0.00%> (-0.02%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

[rmcconnell-r7]

Replaced by: #7960