Merge pull request #1347 in SNORT/snort3 from port_scan_reload to master

Merge pull request #1347 in SNORT/snort3 from port_scan_reload to master

Squashed commit of the following:

commit ef067a063a945799136392e55e97add27c295816
Author: mdagon <mdagon@cisco.com>
Date:   Thu Aug 23 12:45:44 2018 -0400

    inspector manager: if a plugin doesn't have tinit, still mark it as initialized

commit b9ca9be78cd5fab30f18cd6d78134813bbd9334d
Author: Michael Altizer <mialtize@cisco.com>
Date:   Fri Apr 13 09:35:19 2018 -0400

    inspector_manager: Handle tinit for inspectors added during reload