remove clnt_tag.go since not used

[Shamar]

I can't see why clnt_tag.go define the Tag struct providing an interface similar to Clnt. Nobody in the current codebase use it, and I find it a little confusing (the example in the original codebase does not clarify the value that such an interface provides)

However, given that I'm a go newbie, I might be missing something.

Signed-off-by: Giacomo Tesio [email protected]