Merge pull request #2406 in SNORT/snort3 from ~BBANTWAL/snort3:lua_snort_version...

Merge pull request #2406 in SNORT/snort3 from ~BBANTWAL/snort3:lua_snort_version to master

Squashed commit of the following:

commit 84c77e479426a68fc09faf91e43eab75fe5338b5
Author: Bhagya Tholpady <bbantwal@cisco.com>
Date:   Thu Oct 8 15:39:26 2020 -0400

    managers: Delete obsolete variable parsing code

commit d914f1df3c109b3c6de79be2f7ad30a3f8c7a15c
Author: Bhagya Tholpady <bbantwal@cisco.com>
Date:   Thu Oct 8 15:38:56 2020 -0400

    managers: Skip snort_set lua function for non-table top level keys in finalize.lua

commit 5ae145f0d4dedd3bf129de4fdc42404a50734105
Author: Bhagya Tholpady <bbantwal@cisco.com>
Date:   Thu Oct 8 15:38:16 2020 -0400

    main: Add lua variables for snort version and build