Merge pull request #2911 in SNORT/snort3 from ~RAMANKS/snort3:geneve to master

Merge pull request #2911 in SNORT/snort3 from ~RAMANKS/snort3:geneve to master

Squashed commit of the following:

commit f0c32fd35d5763b7e32f1c04b03f5fa457d3552f
Author: Raman Krishnan <ramanks@cisco.com>
Date:   Fri Jun 11 19:52:06 2021 -0700

    codecs: geneve: incorporate review comments

commit abf8a20f05b7a2be16af0472b0d98b4cddded7be
Author: Raman Krishnan <ramanks@cisco.com>
Date:   Sat Jun 5 23:09:27 2021 -0700

    codecs: geneve: add vni to alert_csv and alert_json

commit fb516639ed8f29972df650b782fb5c721c946e60
Author: Raman Krishnan <ramanks@cisco.com>
Date:   Tue Apr 13 15:13:59 2021 -0700

    codecs: geneve: Support for Geneve encapsulation