Merge pull request #1841 in SNORT/snort3 from ~DAVMCPHE/snort3:stream_consolidate_sou...

Merge pull request #1841 in SNORT/snort3 from ~DAVMCPHE/snort3:stream_consolidate_source_files to master

Squashed commit of the following:

commit e50ee5a0450248a37a310b42f9be1e8868cacaa9
Author: davis mcpherson <davmcphe@cisco.com>
Date:   Mon Nov 25 10:46:55 2019 -0500

    stream_tcp: updates from PR review comments

commit 88137cf6242a9378cf6351882f7631947bff9d84
Author: davis mcpherson <davmcphe@cisco.com>
Date:   Mon Nov 11 08:58:57 2019 -0500

    stream_tcp: move and update the libtcp source files to the tcp source directory to consolidate the stream tcp code into one component (libtcp goes away)