Remve attribute ogit:_tags from ogit:optional-attributes

[vteremasov]

What
Remove ogit:_tags described in optional attributes Variable.ttl

https://github.com/arago/OGIT/blob/4553c328c1df08f980486101a21b01f39ca2fe35/NTO/Automation/entities/Variable.ttl#L25-L27

Why

1. We don't need to describe fields such as ogit:_tags or ogit:_content explicitly.
2. It confuses some hiro-graph client libraries

[KaushikGondaliya]

The optional attribute 'ogit:_tags' was added to defines tags for each variable. So information such which variable belongs to which namespace can be gathered.

for ex. 'allowedTypes' has tag 'Auth' then it will be mostly used in Auth namespace.

So what kind of problems it is creating that it needs to be removed?

[vteremasov]

@KaushikGondaliya

I think you don't need to to add this attribute to use it. Same with ogit:_content or ogit:_id. @viteke please correct me if I am wrong.

We have a client library that shows this as an invalid scheme. Anyway, I think we could add a fallback for such cases, but I thought it was added by mistake and created an issue.