some configuration items are not preserved on export/import

[mmguero]

I just noticed that the following values:

• SURICATA_UPDATE_RULES in suricata.env
• EXTRA_TAGS in upload-common.env

are not preserved when doing an export of config followed by an import:

$ ./scripts/configure --load-existing-env --non-interactive --dry-run --export-malcolm-config-file /path/to/export.json
$ /scripts/configure --non-interactive --import-malcolm-config-file /path/to/export.json

It looks like the extra tags isn't exported correctly, while the suricata rule update IS exported correctly but not imported correctly.