Merge pull request #2525 in SNORT/snort3 from ~ARMANDAV/snort3:rna_client_username...

Merge pull request #2525 in SNORT/snort3 from ~ARMANDAV/snort3:rna_client_username to master

Squashed commit of the following:

commit 96f5c71451caa4bed79b5d6a2d8410ea11ae9a32
Author: Arun Mandava <armandav@cisco.com>
Date:   Thu Oct 1 16:54:40 2020 -0400

    rna: User discovery for successful login

commit 31414872a2d2354ef17ac4c1a371c704eea40a3b
Author: Sreeja Athirkandathil Narayanan <sathirka@cisco.com>
Date:   Thu Sep 3 18:07:49 2020 -0400

    appid: Create events for client user name, id and login success