security/suricata: Fix plist issues

suricata-update is failing to find certain python modules when trying
to update rules.

PR: 255397
Reported by: Ian Dickens <ian@south-border.com>
Approved by: maintainer
MFH: 2021Q2

(cherry picked from commit b0e101ec785b9a445e5beca3a5c8351a1537e810)