Merge pull request #2449 in SNORT/snort3 from ~KATHARVE/snort3:h2i_trailers_2 to...

Merge pull request #2449 in SNORT/snort3 from ~KATHARVE/snort3:h2i_trailers_2 to master

Squashed commit of the following:

commit 95037139d8ecd2ec236ecfa747e8411b08f81912
Author: Katura Harvey <katharve@cisco.com>
Date:   Tue Sep 1 17:26:13 2020 -0400

    http2_inspect: fix hpack dynamic table init

commit 79454c069e4247d33cbb565fa1a9cba643d1360d
Author: Katura Harvey <katharve@cisco.com>
Date:   Thu Aug 27 09:18:45 2020 -0400

    http2_inspect: refactor hpack decoding and send trailer to http_inspect for processing