Merge pull request #2052 in SNORT/snort3 from ~MIALTIZE/snort3:freebsd_osx to master

Merge pull request #2052 in SNORT/snort3 from ~MIALTIZE/snort3:freebsd_osx to master

Squashed commit of the following:

commit 23b466c713fcf8ffeed1c3c3f07dc04cdf506d4e
Author: Michael Altizer <mialtize@cisco.com>
Date:   Mon Mar 2 10:07:34 2020 -0500

    build: Fix various build issues on FreeBSD and OS X

commit 0dd9359134dc17194fa31f75d65e6f752675c7af
Author: Michael Altizer <mialtize@cisco.com>
Date:   Mon Mar 2 10:07:34 2020 -0500

    build: Fix LibUUID detection on OS X

commit 30ebcc7187ec3127571caaa8d18aa3fb6516170d
Author: Michael Altizer <mialtize@cisco.com>
Date:   Mon Mar 2 10:07:34 2020 -0500

    http_inspect: Properly mock HttpModule::peg_counts in http_transaction_test