Merge pull request #1591 in SNORT/snort3 from ~MIALTIZE/snort3:static_analysis to...

Merge pull request #1591 in SNORT/snort3 from ~MIALTIZE/snort3:static_analysis to master

Squashed commit of the following:

commit b1dd6db8cc79cc8b0881f508f1c1679165aa92b1
Author: Michael Altizer <mialtize@cisco.com>
Date:   Wed Apr 24 15:39:22 2019 -0400

    piglet_plugins: Don't try to memset SigInfo

commit 846cd74233e2e6de40528e364bb10b5be8421848
Author: Michael Altizer <mialtize@cisco.com>
Date:   Mon Apr 22 13:02:37 2019 -0400

    tcp_connector: Fix memory leak in receive overrun scenario

commit f168872f04abdc26d1ebcb7bc43977b0ecd8bc4e
Author: Michael Altizer <mialtize@cisco.com>
Date:   Mon Apr 22 12:49:41 2019 -0400

    appid: Add assertion to pop3 detector to quiet the static analyzer

commit 7d190cd75022d2cc4e0400e10406c7a182504566
Author: Michael Altizer <mialtize@cisco.com>
Date:   Mon Apr 22 12:36:37 2019 -0400

    module_manager: Fix potential null deref in module parameter dumping