Merge pull request #1131 in SNORT/snort3 from perf_files to master

Merge pull request #1131 in SNORT/snort3 from perf_files to master

Squashed commit of the following:

commit e6f3785c7af8aa67856fce0c9618165352fbda01
Author: Carter Waxman <cwaxman@cisco.com>
Date:   Tue Mar 13 10:26:08 2018 -0400

    PluginManager: enforce all IT_PROBE Inspectors present GLOBAL Modules

commit e7470a81c44ecb506f8cb89cc77a72e95d3b65ba
Author: Carter Waxman <cwaxman@cisco.com>
Date:   Tue Mar 13 09:50:15 2018 -0400

    ModuleManager: globals only load on default policy

commit 50edf8306b1127f1ff150ee9fb699ddbe65a4b6a
Author: Carter Waxman <cwaxman@cisco.com>
Date:   Fri Mar 9 08:24:31 2018 -0500

    DataBus: added ability to unsubscribe to prevent dangling references

commit d60232178001c911176ed0272181f80a913bbe62
Author: Carter Waxman <cwaxman@cisco.com>
Date:   Thu Mar 8 12:05:21 2018 -0500

    perf_monitor: fixed flow_ip outputting erroneous values

commit e003750bf325ed99a6b1186b839f1f40e569d21c
Author: Carter Waxman <cwaxman@cisco.com>
Date:   Mon Feb 19 16:08:54 2018 -0500

    InspectorManager: probes run regardless of active policy

commit 3749d1380583fb2d3b475b76c741fd63bb28f061
Author: Carter Waxman <cwaxman@cisco.com>
Date:   Mon Feb 19 15:30:12 2018 -0500

    perf_monitor: query modules for stats only after they have all loaded

commit dddb7fdd814513d4f195f501d6cff2f6b6dd6760
Author: Carter Waxman <cwaxman@cisco.com>
Date:   Wed Feb 14 16:17:08 2018 -0500

    perf_monitor: decoupled from other modules. now builds dynamically.